<SUBMISSION>
<ACCESSION-NUMBER>0001144204-12-016923
<TYPE>SC 14D9/A
<PUBLIC-DOCUMENT-COUNT>2
<FILING-DATE>20120323
<DATE-OF-FILING-DATE-CHANGE>20120323
<SUBJECT-COMPANY>
<COMPANY-DATA>
<CONFORMED-NAME>ATS CORP
<CIK>0001325460
<ASSIGNED-SIC>8742
<IRS-NUMBER>113747950
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>SC 14D9/A
<ACT>34
<FILE-NUMBER>005-81087
<FILM-NUMBER>12712644
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>7925 JONES BRANCH DRIVE
<CITY>MCLEAN
<STATE>VA
<ZIP>22102
<PHONE>571-766-2400
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>7925 JONES BRANCH DRIVE
<CITY>MCLEAN
<STATE>VA
<ZIP>22102
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>Federal Services Acquisition CORP
<DATE-CHANGED>20050429
</FORMER-COMPANY>
</SUBJECT-COMPANY>
<FILED-BY>
<COMPANY-DATA>
<CONFORMED-NAME>ATS CORP
<CIK>0001325460
<ASSIGNED-SIC>8742
<IRS-NUMBER>113747950
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>SC 14D9/A
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>7925 JONES BRANCH DRIVE
<CITY>MCLEAN
<STATE>VA
<ZIP>22102
<PHONE>571-766-2400
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>7925 JONES BRANCH DRIVE
<CITY>MCLEAN
<STATE>VA
<ZIP>22102
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>Federal Services Acquisition CORP
<DATE-CHANGED>20050429
</FORMER-COMPANY>
</FILED-BY>
<DOCUMENT>
<TYPE>SC 14D9/A
<SEQUENCE>1
<FILENAME>v306754_sc14d9a.htm
<DESCRIPTION>FORM SC 14D9/A
<TEXT>
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<P STYLE="margin: 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>UNITED STATES</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SECURITIES AND EXCHANGE COMMISSION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Washington, D.C. 20549</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SCHEDULE 14D-9</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(Amendment No. 4)</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SOLICITATION/RECOMMENDATION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>STATEMENT UNDER SECTION 14(d)(4) OF THE</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SECURITIES EXCHANGE ACT OF 1934</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 24pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>ATS Corporation</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><I>(Name of Subject Company)</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 24pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>ATS Corporation</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><I>(Name of Person Filing Statement)</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>COMMON STOCK, PAR VALUE $0.0001 PER SHARE</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><I>(Title of Class of Securities)</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>00211E104</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><I>(CUSIP Number of Class of Securities)</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Pamela Little</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Co-Chief Executive Officer and Chief
Financial Officer</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>ATS Corporation</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>7925 Jones Branch Drive</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>McLean, VA 22102</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Telephone: (571) 766-2400</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><I>(Name, address and telephone numbers
of person authorized to receive notices and</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><I>communications on behalf of the persons
filing statement)</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><I>With copies to:</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Squire Sanders (US) LLP</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>1200 19<SUP>th</SUP> Street, NW<BR>
Suite 300<BR>
Washington, D.C. 20036</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Attention: James J. Maiwurm</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Telephone: (202) 626-6600</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 23.75pt"><FONT STYLE="font-family: Wingdings 2">&#163;</FONT>
Check the box if the filing relates solely to preliminary communications made before the commencement of a tender offer.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 23.75pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 23.75pt"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 23.75pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 23.75pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 23.75pt">This Amendment No. 4 (this &ldquo;<U>Amendment</U>&rdquo;)
amends and supplements the Solicitation/Recommendation Statement on Schedule 14D-9 (together with any amendments and supplements
thereto, the &ldquo;<U>Schedule 14D-9</U>&rdquo;) filed by ATS Corporation, a Delaware corporation (&ldquo;<U>ATS</U>&rdquo; or
the &ldquo;<U>Company</U>&rdquo;) with the Securities and Exchange Commission (the &ldquo;<U>SEC</U>&rdquo;) on February 29, 2012,
as amended by Amendment No. 1 to the Schedule 14D-9 filed on March 6, 2012, Amendment No. 2 to the Schedule 14D-9 filed on March
9, 2012 and Amendment No. 3 to the Schedule 14D-9 filed on March 16, 2012. The Schedule 14D-9 relates to the tender offer by Atlas
Merger Subsidiary, Inc., a Delaware corporation (the &ldquo;<U>Offeror</U>&rdquo;) and wholly owned subsidiary of Salient Federal
Solutions, Inc., a Delaware corporation (&ldquo;<U>Parent</U>&rdquo;), to purchase all outstanding shares of the Company&rsquo;s
common stock, par value $0.0001 per share (the &ldquo;<U>Shares</U>&rdquo;), at $3.20 per Share in cash, without interest, upon
the terms and subject to the conditions set forth in the Offer to Purchase, dated February 28, 2012 (the &ldquo;<U>Offer to Purchase</U>&rdquo;),
and in the related Letter of Transmittal (which, together with any amendments or supplements, collectively constitute the &ldquo;<U>Offer</U>&rdquo;).
The Offer is described in a Tender Offer Statement on Schedule TO filed by the Offeror and Parent with the SEC on February 28,
2012, as amended by the Amendment No. 1 to the Schedule TO filed on March 1, 2012, the Amendment No. 2 to the Schedule TO filed
on March 6, 2012<B>,</B> the Amendment No. 3 to the Schedule TO filed on March 9, 2012, the Amendment No. 4 to the Schedule TO
filed on March 16, 2012 and the Amendment No. 5 to the Schedule TO filed on March 23, 2012. The Offer to Purchase and the Letter
of Transmittal were filed with the Schedule 14D-9 as Exhibits (a)(1)(A) and (a)(1)(B), respectively.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 23.75pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 23.75pt">Except as otherwise set forth below, the
information set forth in the Schedule 14D-9 remains unchanged and is incorporated by reference as relevant to the items in this
Amendment. Capitalized terms used and not defined herein shall have the meanings assigned to such terms in the Schedule 14D-9.
This Amendment is being filed to reflect certain updates as reflected below.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 23.75pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>ITEM 8&#9;ADDITIONAL INFORMATION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Item 8 of the Schedule 14D-9 is amended and supplemented by
adding the following before the subsection entitled &ldquo;<I>Forward Looking Statements</I>&rdquo;:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&ldquo;<B><I>Parent Financing</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 24.5pt">Parent entered into an Escrow Agreement
dated as of March 23, 2012 with Citizens Bank of Pennsylvania, King &amp; Spalding LLP and certain Guarantors and Lenders (as defined
therein), pursuant to which the parties agreed on the final forms of the Credit Agreement and related ancillary documents and deliverables
in connection with Parent&rsquo;s debt financing.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 24.5pt">Parent also entered into an Escrow Agreement
dated as of March 23, 2012 with PNC Capital Finance, LLC, Cohen &amp; Grigsby, P.C. and certain Guarantors (as defined therein),
pursuant to which the parties agreed on the final forms of the Note Purchase Agreement and related ancillary documents and deliverables
in connection with Parent&rsquo;s mezzanine financing.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>Extension of the Offer</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>&nbsp;</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The Company, Parent and Purchaser
have agreed to extend the Offer such that it remains open for an additional five business days, until 11:59 p.m., New York
City time, on March 29, 2012. Subject to the satisfaction as of the extended expiration date of the conditions described in
the Offer, Purchaser anticipates that the closing of the Offer and the Merger will occur on or before March 30,
2012.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 24.5pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">The full text of the joint press release issued by the Company
and Parent on March 23, 2012 is filed as Exhibit (a)(12) hereto and is incorporated by reference.&rdquo;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="margin: 0; font-weight: bold">ITEM 9. &nbsp; EXHIBITS.</P>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 12pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 12pt">Item 9 of the Schedule 14D-9 is hereby amended
and supplemented by adding the following exhibit:</P>


<P STYLE="margin: 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; width: 2%; text-indent: 0">&nbsp;</TD>
    <TD NOWRAP STYLE="padding: 0; font-weight: bold; width: 12%; text-indent: 0">Exhibit No.</TD>
    <TD STYLE="padding: 0; width: 2%; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; width: 2%; text-indent: 0">&nbsp;</TD>
    <TD NOWRAP STYLE="padding: 0; font-weight: bold; width: 80%; text-indent: 0">Description</TD>
    <TD STYLE="padding: 0; width: 2%; text-indent: 0">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-indent: 0">(a)(12)</TD>
    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-indent: 0">Joint Press Release issued by ATS Corporation and Salient Federal Solutions on March 23, 2012.</TD>
    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SIGNATURE</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 12pt">After due inquiry and to the best of my knowledge
and belief, I certify that the information set forth in this Statement is true, complete and correct.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 12pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 12pt">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD>
    <TD COLSPAN="3" STYLE="padding: 0; text-indent: 0">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">ATS Corporation&nbsp;</P></TD>
    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD>
    <TD COLSPAN="3" STYLE="padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-indent: 0">By:&nbsp;</TD>
    <TD COLSPAN="2" STYLE="padding: 0; text-decoration: none; text-indent: 0; border-bottom: Black 1pt solid">&nbsp; /s/ Pamela A Little</TD>
    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-indent: 0; width: 50%">&nbsp;</TD>
    <TD STYLE="padding: 0; text-indent: 0; width: 5%">&nbsp;</TD>
    <TD STYLE="padding: 0; text-indent: 0; width: 5%">Name:&nbsp;</TD>
    <TD STYLE="padding: 0; text-indent: 0; width: 35%">Pamela A. Little</TD>
    <TD STYLE="padding: 0; text-indent: 0; width: 5%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-indent: 0">Title:&nbsp;</TD>
    <TD STYLE="padding: 0; text-indent: 0">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Co-Chief Executive Officer and</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Chief Financial Officer</P></TD>
    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD COLSPAN="5" STYLE="padding: 0; text-indent: 0">&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Dated: March 23, 2012</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<TYPE>EX-99.(A)(12)
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<P STYLE="margin: 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SALIENT FEDERAL SOLUTIONS EXTENDS OFFER</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>FOR SHARES OF ATS CORPORATION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 24.5pt"><B>McLean and Fairfax, Virginia, March
23, 2012</B> &mdash;<U> </U>ATS Corporation (NYSE AMEX: ATSC), a leading information technology company that delivers innovative
technology solutions to government and commercial organizations, and Salient Federal Solutions, Inc. ( Salient), a leading provider
of information technology, engineering, and intelligence analytic services to agencies in the intelligence, defense, homeland security,
and cyber domains, today announced that ATSC, Salient and Salient&rsquo;s wholly owned subsidiary, Atlas Merger Subsidiary, Inc.
(&ldquo;Purchaser&rdquo;), have agreed to extend the expiration date for Purchaser&rsquo;s tender offer for all of the outstanding
shares of common stock of ATSC at a price of $3.20 per share net to the holder in cash, without interest and less any required
withholding and transfer taxes, until 11:59 p.m., New York City time, on Thursday, March 29, 2012. The offer had been previously
scheduled to expire at 11:59 p.m., New York City time, on Monday, March 26, 2012. The tender offer was initiated pursuant to an
Offer to Purchase and related Letter of Transmittal, each dated February 28, 2012, and a merger agreement dated February 21, 2012
among ATSC, Salient and Purchaser (the &ldquo;Merger Agreement&rdquo;).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 24.5pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 24.5pt">Salient also announced that on March 23,
2012, it has entered into escrow agreements pursuant to which the parties agreed on the final forms of a credit agreement and note
purchase agreement and related ancillary documents and deliverables in connection with the debt and mezzanine financings, and that
the parties thereto entered into escrow agreements and deposited such documents and the signature pages of the parties into escrow
to be automatically released on satisfaction of customary conditions including the concurrent consummation of the merger and the
other transactions contemplated by the Merger Agreement in accordance with its terms and the concurrent closing of Salient&rsquo;s
equity financing.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 24.5pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 24.5pt">Accordingly, pursuant to Rule
14d-4(d) under the Securities Exchange Act of 1934, the offer must remain open for an additional five business days. Subject
to the satisfaction as of the extended expiration date of the conditions described in the offer to purchase and letter of
transmittal, Salient anticipates that the closing of the tender offer and merger will occur on or before March 30,
2012.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>About ATSC</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">ATSC is a leading provider of software and systems development,
systems integration, infrastructure management and outsourcing, information sharing, training and consulting to the Department
of Defense, federal civilian agencies, public safety and national security customers, as well as commercial enterprises. Headquartered
in McLean, Virginia, the Company has more than 400 employees.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Website: <U>www.atsc.com</U>.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>About Salient Federal Solutions</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Salient Federal Solutions is a leading provider of Federal IT
and engineering solutions that enable government and industry to respond quickly to new or surge mission requirements with exactly
the right people, skills, expertise, and technical solutions. The company works to accelerate mission impact by delivering highly
adaptable technology services, engineering solutions, and domain expertise that enable customers to rapidly meet the pressing requirements
of today, while anticipating tomorrow's evolving challenges. Salient Federal Solutions is headquartered in Fairfax, Va., with offices
in Colorado Springs, Orlando, San Diego, and Tampa.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Website: www.salientfed.com</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Additional Information</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">This communication is neither an offer to purchase nor solicitation
of an offer to sell securities. A subsidiary of Salient has filed a tender offer statement on Schedule TO with the Securities and
Exchange Commission (the &ldquo;SEC&rdquo;), and ATSC has filed a solicitation/recommendation statement on Schedule 14D-9, with
respect to the offer. The tender offer statement (including an offer to purchase, a related letter of transmittal and other offer
documents) and the solicitation/recommendation statement contain important information that should be read carefully before any
decision is made with respect to the tender offer. Those materials have been made available to ATSC&rsquo;s stockholders at no
expense to them. In addition, all of those materials (and all other offer documents filed with the SEC) are available at no charge
on the SEC&rsquo;s website: www.sec.gov.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Forward-looking Statements</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">All statements in this press release that do not directly and
exclusively relate to historical facts constitute &ldquo;forward-looking statements&rdquo; within the meaning of that term in Section
27A of the United States Securities Act of 1933, as amended, and Section 21E of the United States Securities Exchange Act of 1934,
as amended. These statements and this information represent ATSC&rsquo;s intentions, plans, expectations and beliefs, and are subject
to risks, uncertainties and other factors, of which many are beyond the control of ATSC. These factors could cause actual results
to differ materially from such forward-looking statements or forward-looking information. These factors include but are not restricted
to: uncertainties as to the timing of the tender offer and the merger; uncertainties as to how many of ATSC&rsquo;s stockholders
will tender their shares in the offer; the risk that competing offers will be made; the possibility that various closing conditions
for the transaction may not be satisfied or waived, including regulatory clearance; ATSC&rsquo;s dependence on contracts with federal
government agencies for the majority of its revenue, ATSC&rsquo;s dependence on its GSA schedule contracts and its position as
a prime contractor on government-wide acquisition contracts to grow its business, and other factors discussed in ATSC&rsquo;s latest
annual report on Form 10-K filed with the Securities and Exchange Commission on February 17, 2011. The words &ldquo;believe,&rdquo;
&ldquo;estimate,&rdquo; &ldquo;expect,&rdquo; &ldquo;intend,&rdquo; &ldquo;anticipate,&rdquo; &ldquo;foresee,&rdquo; &ldquo;plan,&rdquo;
and similar expressions and variations thereof, identify certain of such forward-looking statements or forward-looking information,
which speak only as of the date on which they are made. ATS disclaims any intention or obligation to publicly update or revise
any forward-looking statements or forward-looking information, whether as a result of new information, future events or otherwise,
except as required by applicable law. Readers are cautioned not to place undue reliance on these forward-looking statements or
on this forward-looking information.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">For more information:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Investors and financial media</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">For ATSC:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Joann O'Connell</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Vice President, Investor Relations</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">ATS Corporation</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">+1-571-766-2400</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">For Salient Federal Solutions:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Kari Walker</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">kwalker@encmarketing.com</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">703-928-9996</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>



<P STYLE="margin: 0"></P>

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