<SUBMISSION>
<ACCESSION-NUMBER>0001104659-08-072570
<TYPE>425
<PUBLIC-DOCUMENT-COUNT>1
<FILING-DATE>20081124
<DATE-OF-FILING-DATE-CHANGE>20081124
<SUBJECT-COMPANY>
<COMPANY-DATA>
<CONFORMED-NAME>KRATOS DEFENSE & SECURITY SOLUTIONS, INC.
<CIK>0001069258
<ASSIGNED-SIC>4899
<IRS-NUMBER>133818604
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1228
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>425
<ACT>34
<FILE-NUMBER>000-27231
<FILM-NUMBER>081209167
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>4810 EASTGATE MALL
<STREET2>.
<CITY>SAN DIEGO
<STATE>CA
<ZIP>92121
<PHONE>858-812-7300
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>4810 EASTGATE MALL
<STREET2>.
<CITY>SAN DIEGO
<STATE>CA
<ZIP>92121
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>WIRELESS FACILITIES INC
<DATE-CHANGED>19990817
</FORMER-COMPANY>
</SUBJECT-COMPANY>
<FILED-BY>
<COMPANY-DATA>
<CONFORMED-NAME>KRATOS DEFENSE & SECURITY SOLUTIONS, INC.
<CIK>0001069258
<ASSIGNED-SIC>4899
<IRS-NUMBER>133818604
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1228
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>425
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>4810 EASTGATE MALL
<STREET2>.
<CITY>SAN DIEGO
<STATE>CA
<ZIP>92121
<PHONE>858-812-7300
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>4810 EASTGATE MALL
<STREET2>.
<CITY>SAN DIEGO
<STATE>CA
<ZIP>92121
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>WIRELESS FACILITIES INC
<DATE-CHANGED>19990817
</FORMER-COMPANY>
</FILED-BY>
<DOCUMENT>
<TYPE>425
<SEQUENCE>1
<FILENAME>a08-29109_2425.htm
<DESCRIPTION>425
<TEXT>

<html>

<head>





</head>

<body lang="EN-US">

<div style="font-family:Times New Roman;">

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Filed by Kratos Defense&nbsp;&amp; Security
Solutions,&nbsp;Inc.</font></p>

<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to Rule&nbsp;425</font></p>

<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">under the Securities Act of 1933 and</font></p>

<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">deemed filed pursuant to Rule&nbsp;14a-6 under</font></p>

<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">the Securities Exchange Act of 1934, as amended</font></p>

<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Subject Company: Kratos Defense&nbsp;&amp; Security
Solutions,&nbsp;Inc.</font></p>

<p align="right" style="font-size:10.0pt;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman"><font style="font-size:10.0pt;">Commission File No: 000-</font>  </font>27231</p>

<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Sent
to all Digital Fusion employees on Friday afternoon at 3:03 p.m. PST:</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">21 November&nbsp;2008</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">All,</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Our
Board of Directors has unanimously approved an agreement for Digital Fusion,&nbsp;Inc.
to merge with Kratos Defense&nbsp;&amp; Security Solutions,&nbsp;Inc. in a
stock for stock transaction. This merger will be officially announced in a
press release on Monday, November&nbsp;24th.&#160;
You should keep information regarding the transaction confidential until
the official announcement. Under the agreement, which is subject to customary
closing conditions, including approval of the transaction by DFI and Kratos
shareholders, DFI shareholders will own approximately 23 percent of the
combined company.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Kratos
is a rapidly growing company in the defense sector that provides mission
critical engineering, IT services and war fighter solutions for the U.S.
federal government, and for state and local agencies. Kratos has a significant
amount of high technology work that will provide key synergies with our employees
and additional key capabilities to broaden target markets.&#160; In addition, Kratos&#146; considerable defense
presence in Huntsville will provide us with the larger company past experience
needed for us to compete for much larger contract awards. The combined company
will provide the Department of Defense, as well as other federal, state and
local government customers, with an expanded portfolio of capabilities and
qualifications.&#160; The transaction will
also provide for much greater liquidity for Digital Fusion stockholders.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">I am
very excited about Digital Fusion joining the Kratos family. More information
will be provided as we move closer to closing the deal.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Gary S. Ryan</font></p>
  </td>
  <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">CEO</font></p>
  </td>
  <td width="50%" valign="top" style="padding:0in 0in 0in 0in;width:50.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">This communication is being made in respect of
the proposed transaction involving Kratos and DFI.&nbsp; In connection with the
proposed transaction, Kratos plans to file with the SEC a Registration
Statement on Form&nbsp;S-4 containing a Joint Proxy Statement/Prospectus, and,
Kratos plans to file with the SEC other documents regarding the proposed
transaction. The definitive Joint Proxy Statement/Prospectus will be mailed to
stockholders of Kratos and DFI.&#160; </font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">INVESTORS
AND SECURITY HOLDERS ARE URGED TO READ THE JOINT PROXY STATEMENT/PROSPECTUS AND
OTHER DOCUMENTS FILED WITH THE SEC CAREFULLY IN THEIR ENTIRETY WHEN THEY BECOME
AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED
TRANSACTION.</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Investors and security holders will be able to
obtain free copies of the Registration Statement and the Joint Proxy Statement/Prospectus
(when available) and other documents filed with the SEC by Kratos through the
web site maintained by the SEC at <i>www.sec.gov</i>.
In addition, investors and security holders will be able to obtain free copies
of the Registration Statement and the Joint Proxy Statement/Prospectus (when
available) and other documents filed with the SEC from Kratos by directing a
request to Kratos Defense&nbsp;&amp; Security Solutions, Inc, ATTN: Investor
Relations, 4810 Eastgate Mall, San Diego, CA 92121, or going to Kratos&#146; corporate
website at <i>www.kratosdefense.com</i>.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Kratos and DFI, and their respective directors
and executive officers, may be deemed to be participants in the solicitation of
proxies in respect of the proposed transaction. Information regarding Kratos&#146;
directors and executive officers is contained in its annual proxy statement
filed with the SEC on May&nbsp;22, 2008. Additional information regarding the
interests of such potential participants will be included in the Joint Proxy
Statement/Prospectus and the other relevant documents filed with the SEC (when
available).</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>

</div>
<!-- SEQ.=1,FOLIO='',FILE='C:\JMS\105730\08-29109-2\task3235762\29109-2-bc.htm',USER='105730',CD='Nov 23 14:20 2008' -->


</body>

</html>
</TEXT>
</DOCUMENT>
</SUBMISSION>
