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<TYPE>425
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<FILING-DATE>20081124
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<CONFORMED-NAME>KRATOS DEFENSE & SECURITY SOLUTIONS, INC.
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<FILM-NUMBER>081209166
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<BUSINESS-ADDRESS>
<STREET1>4810 EASTGATE MALL
<STREET2>.
<CITY>SAN DIEGO
<STATE>CA
<ZIP>92121
<PHONE>858-812-7300
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<STREET1>4810 EASTGATE MALL
<STREET2>.
<CITY>SAN DIEGO
<STATE>CA
<ZIP>92121
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<FORMER-CONFORMED-NAME>WIRELESS FACILITIES INC
<DATE-CHANGED>19990817
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<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1228
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<FORM-TYPE>425
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<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>
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<FORMER-CONFORMED-NAME>WIRELESS FACILITIES INC
<DATE-CHANGED>19990817
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<TEXT>

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<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 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;">Sent
to all Kratos employees on Monday morning with press release included as an attachment:</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;">24 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;">The attached press release
announces that we have reached agreement on a merger with Digital Fusion,&nbsp;Inc.
of Huntsville, AL.&#160; As we have discussed
previously, the defense industry is seeing significant consolidation.&#160; We continue to execute on our strategic plan
by being a consolidator of other small or mid-sized government contractors to
help us realize our goal of being the premier mid-tier national and homeland
security, and public safety and security, contractor.</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;">As the U.S. government
continues with its Base Realignment and Closure (BRAC) plan, certain geographic
locations benefit as activities formerly performed at a variety of locations
are now being focused on a smaller number of key areas.&#160;&#160; We will continue to focus our effort on
these BRAC recipient locations, primarily San Diego and the greater Washington,
D.C. area, in addition to Huntsville.</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.&#160; More
information will be provided as we get closer to closing the deal.&#160; Please read through the attached press release
for additional information on this transaction.&#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;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Eric DeMarco</font></p>

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

<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.</font></p>

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

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