ALION SCIENCE & TECHNOLOGY CORP
EX-10.66
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<TYPE>EX-10.66
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<DESCRIPTION>EX-10.66
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<DIV align="right" style="font-size: 10pt; margin-top: 12pt"><B>Exhibit&nbsp;10.66</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><U><B>FOURTH AMENDMENT TO THE SELLER WARRANT AGREEMENT</B></U>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;THIS <B>FOURTH AMENDMENT TO THE SELLER WARRANT AGREEMENT </B>(the &#147;Amendment&#148;) is made effective as
of March&nbsp;27, 2006, between Alion Science and Technology Corporation, a Delaware corporation (the
&#147;Company&#148;), and Illinois Institute of Technology, an Illinois not-for-profit corporation (&#147;IIT&#148;).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;WHEREAS, the Company, IIT Research Institute, an Illinois not-for-profit corporation
affiliated with and controlled by IIT (&#147;IITRI&#148;), and Alion Science and Technology Corporation
Employee Ownership, Savings and Investment Trust (the &#147;Trust&#148;) entered into that certain Seller
Warrant Agreement dated as of the 20<SUP style="font-size: 85%; vertical-align: text-top">th</SUP> day of December&nbsp;2002 (the &#147;Seller Warrant
Agreement&#148;), pursuant to which the Company issued to IITRI warrants to purchase One Million Eighty
Thousand Four Hundred Thirty-Six and Eight-Tenths (1,080,436.8) shares of the Company&#146;s $0.01 par
value per share common stock (&#147;Common Stock&#148;);
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;WHEREAS, as of July&nbsp;1, 2004, IITRI transferred to IIT all its rights and interests in the
Seller Warrant Agreement;
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;WHEREAS, the Company and IIT entered into that certain First Amendment to the Seller Warrant
Agreement effective as of December&nbsp;16, 2004 (the &#147;First Amendment&#148;), pursuant to which the parties
agreed to certain amendments to the Seller Warrant Agreement;
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;WHEREAS, the Company and IIT entered into that certain Second Amendment to the Seller Warrant
Agreement effective as of January&nbsp;24, 2005 (the &#147;Second Amendment&#148;), pursuant to which the parties
agreed to certain further amendments to the Seller Warrant Agreement;
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;WHEREAS, the Company and IIT entered into that certain Third Amendment to the Seller Warrant
Agreement effective as of March&nbsp;8, 2005 (the &#147;Third Amendment&#148;), pursuant to which the parties
agreed to certain further amendments to the Seller Warrant Agreement (as amended by the First
Amendment, the Second Amendment and the Third Amendment, the &#147;Amended Seller Warrant Agreement&#148;);
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;WHEREAS, the Company and IIT desire to amend Sections&nbsp;3(l)(i), 3(l)(iii) and 16(c) of the
Amended Seller Warrant Agreement as set forth herein; and
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;WHEREAS, the Trust is a party to the Amended Seller Warrant Agreement only for the purposes of
<U>Sections&nbsp;6, 7, 15 and 17 through 25</U> of the Amended Seller Warrant Agreement, and pursuant
to Section&nbsp;18 of the Amended Seller Warrant Agreement, Sections&nbsp;3(l)(i), Section&nbsp;3(l)(iii) and
16(c) may be amended by the mutual written agreement of the Company and IIT, without the need to
obtain the Trust&#146;s consent.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;NOW, THEREFORE, in consideration of the premises set forth above and the respective covenants
and agreements contained in this Amendment, and for other good and valuable consideration, the
receipt and sufficiency of which is hereby mutually acknowledged, and intending to be legally
bound, the parties hereto hereby agree as follows:
</DIV>
<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;Third Amendment to the Seller Warrant Agreement
</DIV>


<P align="center" style="font-size: 10pt">&nbsp;
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<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.&nbsp;<U>Amendments to the Amended Seller Warrant Agreement</U>.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;Section&nbsp;3(l)(i) of the Amended Seller Warrant Agreement is hereby amended by deleting the
entire text of Section&nbsp;3(l)(i) and substituting in lieu thereof:
</DIV>



<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 3%">&#147;SARs issued to employees, consultants, officers or directors of the Company or any
of its Subsidiaries with an exercise price no less than Fair Value, except for such
amount of SARs that, at the time of issuance, would cause the aggregate number of
SARs then outstanding (excluding any SARs that have (x)&nbsp;been exercised, (y)&nbsp;expired,
terminated unexercised, or become unexercisable or (z)&nbsp;been forfeited or otherwise
terminated, surrendered or canceled) to be in excess of:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 3%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) two percent (2%) of the number of then outstanding shares of Common Stock
on a fully diluted basis (assuming the exercise of all outstanding options, warrants
and rights and the conversion into Common Stock of all convertible securities) at
the first anniversary of the Effective Date;
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 3%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) four percent (4%) of the number of then outstanding shares of Common Stock
on a fully diluted basis (assuming the exercise of all outstanding options, warrants
and rights and the conversion into Common Stock of all convertible securities) at
the second anniversary of the Effective Date;
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 3%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3) the sum of (a)&nbsp;thirty-three thousand (33,000), plus (b)&nbsp;the amount equal to
six percent (6%) of the number of then outstanding shares of Common Stock on a fully
diluted basis (assuming the exercise of all outstanding options, warrants and rights
and the conversion into Common Stock of all convertible securities), at the third
anniversary of the Effective Date;
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 3%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(4) the sum of (a)&nbsp;thirty-three thousand (33,000), plus (b)&nbsp;the amount equal to
nine percent (9%) of the number of then outstanding shares of Common Stock on a
fully diluted basis (assuming the exercise of all outstanding options, warrants and
rights and the conversion into Common Stock of all convertible securities), at the
fourth anniversary of the Effective Date; and
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 3%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(5) the sum of (a)&nbsp;thirty-three thousand (33,000), plus (b)&nbsp;the amount equal to
twelve percent (12%) of the number of then outstanding shares of Common Stock on a
fully diluted basis (assuming the exercise of all outstanding options, warrants and
rights and the conversion into Common Stock of all convertible securities), at the
fifth anniversary of the Effective Date.&#148;
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;Section&nbsp;3(l)(iii) of the Amended Seller Warrant Agreement is hereby amended by deleting
the entire text of Section&nbsp;3(l)(iii) and substituting in lieu thereof:
</DIV>



<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 3%">&#147;shares of Common Stock issued to the ESOP in connection with employees&#146; purchase of
ESOP interests after the Effective Date via payroll deductions, at a purchase price
which is the lesser of (x)&nbsp;the Fair Value as of the date of issuance of such Common
Stock as determined by an independent appraiser in connection
</DIV>

<P align="center" style="font-size: 10pt">2
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<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 3%">with the ESOP (&#147;Full Price Employee Contributions&#148;), or (y)&nbsp;the Fair Value resulting
from the immediately preceding appraisal of the Common Stock performed by an
independent appraiser in connection with the ESOP (&#147;Price Protected Employee
Contributions&#148;), except for such amount of shares that, at the time of issuance,
would cause the aggregate value of all Price Protected Employee Contributions (in
each case the total value of a Price Protected Employee Contribution shall be the
dollar value of the payroll deduction made in connection with such Price Protected
Employee Contribution) to exceed five percent (5%) of the Company&#146;s aggregate
consolidated payroll expenses (i.e., the aggregate payroll expenses of the Company
and any of the Company&#146;s Subsidiaries substantially all of whose employees are
eligible to participate in the ESOP) from the Effective Date to the date of such
contributions, measured at the end of each plan year for the ESOP.&#148;
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)&nbsp;Section&nbsp;16(c) of the Amended Seller Warrant Agreement is hereby amended by deleting the
entire text of Section 16(c) and substituting in lieu thereof:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 3%">&#147;As long as none of the clauses (a), (b)&nbsp;or (c)&nbsp;of the definition of Current
Market Price in <U>Section&nbsp;3(c)(ii)</U> is applicable to the Common Stock, all SARs
issued by the Company will be issued with an exercise price no less than the per
share value of the Common Stock as set forth in the then most recent appraisal
performed by an independent appraiser at the Company&#146;s request in connection with
the ESOP. If one of the clauses (a), (b)&nbsp;or (c)&nbsp;of the definition of Current Market
Price in <U>Section&nbsp;3(c)(ii)</U> is applicable to the Common Stock, all SARs issued
by the Company will be issued with an exercise price no less than the then current
Current Market Price. All SARs issued by the Company will vest in accordance with
the terms of the Company&#146;s Stock Appreciation Rights Plan, as in effect at the time
of issuance. The Company will not issue SARs that cause the aggregate number of
outstanding SARs (excluding any SARs that have been exercised, that have expired,
terminated unexercised, or become unexercisable or that have been forfeited or
otherwise terminated, surrendered or cancelled), at the time of issuance, to be in
excess of:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 3%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) two percent (2%) of the number of then outstanding shares of Common Stock
on a fully diluted basis (assuming the exercise of all outstanding options, warrants
and rights and the conversion into Common Stock of all convertible securities) at
the first anniversary of the Effective Date;
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 3%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) four percent (4%) of the number of then outstanding shares of Common Stock
on a fully diluted basis (assuming the exercise of all outstanding options, warrants
and rights and the conversion into Common Stock of all convertible securities) at
the second anniversary of the Effective Date;
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 3%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3) the sum of (a)&nbsp;thirty-three thousand (33,000), plus (b)&nbsp;the amount equal to
six percent (6%) of the number of then outstanding shares of Common Stock on a fully
diluted basis (assuming the exercise of all outstanding options, warrants and rights
and the conversion into Common Stock of all convertible securities), at the third
anniversary of the Effective Date;
</DIV>

<P align="center" style="font-size: 10pt">3
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<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 3%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(4) the sum of (a)&nbsp;thirty-three thousand (33,000), plus (b)&nbsp;the amount equal to
nine percent (9%) of the number of then outstanding shares of Common Stock on a
fully diluted basis (assuming the exercise of all outstanding options, warrants and
rights and the conversion into Common Stock of all convertible securities), at the
fourth anniversary of the Effective Date; and
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 3%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(5) the sum of (a)&nbsp;thirty-three thousand (33,000), plus (b)&nbsp;the amount equal to
twelve percent (12%) of the number of then outstanding shares of Common Stock on a
fully diluted basis (assuming the exercise of all outstanding options, warrants and
rights and the conversion into Common Stock of all convertible securities), at the
fifth anniversary of the Effective Date.&#148;
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.&nbsp;<U>Waivers</U>. The parties hereto hereby agree that neither the execution of this
Amendment nor any provision contained herein shall be deemed to in any way affect or act to
restrict or terminate the provisions of Section 2 of the First Amendment or Section&nbsp;2 of the
Second Amendment, including without limitation, any waivers and releases granted to and/or given
for the benefit of the Company therein.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.&nbsp;<U>Remainder of the Amended Seller Warrant Agreement Not Affected</U>. Except as set
forth in Section&nbsp;1 hereof, the terms and provisions of the Amended Seller Warrant Agreement remain
in full force and effect without change, amendment, waiver or modification.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.&nbsp;<U>Ratification</U>. As modified hereby, the Amended Seller Warrant Agreement and its
terms and provisions are hereby ratified for all purposes and in all respects.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.&nbsp;<U>Counterparts</U>. This Amendment may be executed in one or more counterparts, all of
which taken together shall constitute one instrument.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.&nbsp;<U>References</U>. From and after the date provided above, all references to the Amended
Seller Warrant Agreement shall be deemed to be references to the Amended Seller Warrant Agreement
as modified hereby.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.&nbsp;<U>Governing Law</U>. This Amendment shall be governed by and construed in accordance
with the laws of the State of Delaware, without regard to the conflict of laws principles thereof.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.&nbsp;<U>Conflict</U>. In the event of any conflict between the terms of this Amendment and the
Amended Seller Warrant Agreement, the terms of this Amendment shall govern.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B><I>&#091;Signatures follow on next page&#093;</I></B>
</DIV>



<P align="center" style="font-size: 10pt">4
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<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>IN WITNESS WHEREOF, </B>the parties hereto have caused this Amendment to be executed by its
officers thereunto duly authorized as of the date hereof.
</DIV>
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<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><B>Alion Science and Technology Corporation</B></TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left"><B>Illinois Institute of Technology</B></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
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<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By:
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;/s/ Bahman Atefi
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">By:&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;/s/ Lewis Collens
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Name: Bahman Atefi</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">Name: Lewis Collens</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Title: Chief Executive Officer</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">Title: President</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
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