**FORM OF UNIT WARRANT** 3.2  *Exercise and Number of Shares*.    Subject to the provisions of this Agreement, the Holder of this Warrant shall have the rightto purchase from the Company (and the Company shall issue and sell to such Holder), in the aggregate, up to              shares of the Company’s Common Stock. This Warrant may beexercised in whole or in part in as many exercises as Holder may elect. The Exercise Price shall be payable by check for good and sufficient United States funds.  3.3  *Delivery*.    The Warrant shall be exercisable by (i) delivering to the Company the form of notice of exercise attached heretoas *Exhibit A* duly completed and signed by the Holder or by the duly appointed legal representative or duly authorized attorney thereof, and (ii) depositing with the Company the original of this Warrant, paying the aggregate Exercise Price forthe number of shares of Common Stock in respect of which the Warrant is being exercised. Upon each partial exercise of the Warrant, a new Warrant evidencing the balance of the shares of Common Stock issuable hereunder will be issued to the Holder,as soon as reasonably practicable, on the same terms as the Warrant partially exercised. All payments due upon any exercise of this Warrant shall be made in cash or by check.  3.4  *Time of Exercise*.    This Warrant shall be deemed to have been exercised immediately prior to the close of business on thedate of its surrender for exercise and the person entitled to receive the shares of Common Stock issuable upon such exercise shall be treated for all purposes as the holder of record of such shares as of the close of business on such date; provided,however, that in the event that the transfer books of the Company are closed on the date of exercise, the Holder shall be deemed to have become a stockholder of record on the next succeeding day that the transfer books are open and until such date,the Company shall be under no duty to cause to be delivered any certificate for such shares. As promptly as practicable on or after such date and in any event within ten (10) days thereafter, the Company at its expense shall issue and deliver to theperson or persons entitled to receive the same a certificate or certificates for the number of shares issuable upon such exercise. In the event that this Warrant is exercised in part, the Company at its expense will execute and deliver a new Warrantof like tenor exercisable for the number of shares for which this Warrant may then be exercised.  3.5  *Cashless Exercise*.    Subject to the other provisions of this Agreement, in lieu of any cash payment required upon exercise of the Warrant, the Holder may elect to exercise this Warrant in full orin part by surrendering this Warrant in the manner specified in this *Section 3* in exchange for the number of shares of Common Stock equal to the product of (i) the number of shares of Common Stock as to which the Warrant is being exercisedmultiplied by (ii) a fraction, (y) the numerator of which is the Fair Market Value of a share of Common Stock on the date of exercise less the Exercise Price, and (z) the denominator of which is the Fair Market Value of a share of Common Stock onsuch date of exercise.  4.  *Payment of Taxes and Expenses*.    The Company shall pay allexpenses in connection with, and all taxes and other governmental charges that may be imposed with respect to, the issuance or delivery of this Warrant and the Warrant Stock, unless any such tax or charge is imposed by law upon the Holder or uponthe income or gain of Holder in connection with this Warrant, in which case such tax or charge shall be paid by the Holder. The Company shall not be required, however, to pay any tax or other charge imposed in connection with any transfer involvedin the issuance of any certificate for shares of Common Stock in any name other than 2 
 **FORM OF UNIT WARRANT** that of the Holder, and in such case the Company shall not be required to issue or deliver any stock certificate until such tax or other charge has been paid or it has been established to the satisfaction of theCompany that no such tax or other charge is due.  5.  *No Fractional Shares*.    Nofractional shares shall be issued upon the exercise of this Warrant. In lieu of any fractional share to which the Holder would otherwise be entitled, the Company shall make a cash payment equal to the Exercise Price multiplied by such fraction. 6.  *Replacement of Warrant*.    On receipt of evidence reasonably satisfactory to theCompany of the loss, theft, destruction or mutilation of this Warrant and, in the case of loss, theft or destruction, on delivery of an indemnity agreement reasonably satisfactory in form and substance to the Company or, in the case of mutilation,or surrender and cancellation of this Warrant, the Company at its expense shall execute and deliver, in lieu of this Warrant, a new warrant of like tenor and amount.  7.  *Adjustments.* (a)  *Adjustment*.    The number of shares of Common Stock for which this Warrant is exercisable and the Exercise Price at which such shares may be purchased shall be subject to adjustment from time totime as set forth in this *Section 7*.  (b)  Stock Dividends, Subdivisions and Combinations. Ifat any time the Company shall:  (i)  pay or make a dividend on Common Stock payable in additionalshares of Common Stock;  (ii)  subdivide its outstanding shares of Common Stock into a larger numberof shares of Common Stock; or  (iii)  combine its outstanding shares of Common Stock into a smallernumber of shares of Common Stock;  then (A) the number of shares of Common Stock for which this Warrant is exercisable immediately after the happening ofsuch event shall be adjusted to equal the number of shares of Common Stock which a record holder of the same number of shares of Common Stock immediately prior to the happening of such event would own or be entitled to receive after the happening ofsuch event, and (B) the Exercise Price shall be adjusted to equal (1) the Exercise Price multiplied by the number of shares of Common Stock for which this Warrant is exercisable immediately prior to the adjustment divided by (2) the number of sharesfor which this Warrant is exercisable immediately after such adjustment.  (c)  *Dividends andDistributions*.    If the Company shall distribute to all holders of its outstanding shares of Common Stock evidence of indebtedness of the Company, cash (including cash dividends payable out of consolidated earnings or earnedsurplus) or assets or securities other than additional shares of Common Stock, including stock of a subsidiary but excluding dividends or distributions referred to in *Section 7(b)* above (any such evidences of indebtedness, cash, assets orsecurities, the “assets or securities”), then, in each case, the number 3 
 **FORM OF UNIT WARRANT** of shares of Common Stock issuable after such record date to Holder upon the exercise of each Warrant shall be determined by multiplying the number of shares of Common Stock issuableupon the exercise of such Warrant immediately prior to such record date by a fraction, the numerator of which shall be the fair market value per share of Common Stock immediately prior to the record date for such distribution and the denominator ofwhich shall be the fair market value per share of Common Stock immediately prior to the record date for such distribution less the then fair value (as determined in good faith by the Board) of the evidences of its indebtedness, cash or assets orother distributions so distributed attributable to one share of Common Stock. Such adjustment shall be made whenever any such distribution is made, and shall become effective on the date of distribution retroactive to the record date for thedetermination of stockholders entitled to receive such distribution. Any adjustment required by this *Section 7(c)* shall be made whenever any such distribution is made, and shall become effective on the date of such distribution retroactive tothe record date for the determination of stockholders entitled to receive such distribution.  (d)  *Reorganization, Reclassification, Consolidation or Merger*.    If the Company shall (i) effect any reorganization or reclassification of its capital stock or (ii) consolidate or merge with or into,or transfer all or substantially all of its properties and assets to, any other person, in either case the Company shall give the holder at least thirty (30) days prior written notice of such action. During such thirty (30) day period, the Holdershall have the right to exercise this Warrant in whole or in part in accordance with the terms hereof. In the event that the Holder does not exercise this Warrant or any part hereof prior to the consummation of such transaction, then immediatelyupon the consummation of such transaction this Warrant and all rights hereunder shall immediately terminate without further notice to the Holder or further action on the part of the Company.  (e)  All calculations under this *Section 7* shall be made to the nearest cent or to the nearest one-hundredth of a share, as the case may be. 8.  *No Rights of Stockholders*.    Subject to this Warrant, the Holder shall not beentitled to vote, to receive dividends or subscription rights, or to be deemed the holder of Common Stock or any other securities of the Company that may at any time be issuable on the exercise hereof for any purpose, nor shall anything containedherein be construed to confer upon the Holder, as such, any of the rights of a stockholder of the Company, including without limitation any right to vote for the election of directors or upon any matter submitted to stockholders, to give or withholdconsent to any corporate action (whether upon any recapitalization, issuance of stock, reclassification of stock, change of par value or change of stock to no par value, consolidation, merger, conveyance, or otherwise), to receive notices, orotherwise, until the Warrant shall have been exercised as provided herein.  9.  *Transfer of Warrant.* 9.1  *Warrant Register*.    The Company will maintain a register (the“Warrant Register”) containing the names and addresses of the Holder or Holders. Any Holder of this Warrant or any portion thereof may change its address as shown on the Warrant Register by written notice to the Company requesting suchchange, and the Company shall promptly make such change. Until this Warrant is transferred on the Warrant Register of the Company, the 4 
 **FORM OF UNIT WARRANT** Company may treat the Holder as shown on the Warrant Register as the absolute owner of this Warrant for all purposes, notwithstanding any notice to the contrary.  9.2  *Exchange of Warrant Upon a Transfer*.    On surrender of this Warrant for exchange, properlyendorsed on the Assignment attached hereto and subject to the provisions of this Warrant and with the limitations on assignments and transfers as contained in this *Section 9*, the Company at its expense shall issue to or on the order of theHolder a new warrant or warrants of like tenor, in the name of the Holder or as the Holder (on payment by the Holder of any applicable transfer taxes) may direct, for the number of shares issuable upon exercise hereof.  10.  *Reservation and Authorization of Common Stock.* (a)  The Company shall at all times reserve and keep available for issuance upon the exercise of this Warrant the maximum number of its authorized butunissued shares of Common Stock as could then potentially be required to permit the exercise in full of this and all outstanding Warrants. All shares of Common Stock issuable upon exercise of any Warrant and payment therefor in accordance with theterms of such Warrant shall be duly and validly issued and fully paid and nonassesable, and not subject to or privileged with any preemptive rights.  (b)  Before taking any action which would cause an adjustment reducing the Exercise Price below the then par value, if any, of the shares of Common Stockissuable upon exercise of the Warrants, the Company shall take any corporate action which may be necessary in order that the Company may validly and legally issue fully paid and nonassessable shares of such Common Stock at such adjusted ExercisePrice.  10.  *Notices*.    Any notice, request, consent or other communication required to bemade hereunder shall be deemed to have been made: (a) in the case of personal delivery, on the date of such delivery; (b) in the case of mailing, on the third business day following the date of such mailing; and (c) in the case of facsimiletransmission, when confirmed by facsimile machine report to the parties at the following addresses:  If toHolder:                                                                                                                                                      If to Company:  5904 Richmond Highway Suite 300Alexandria, Virginia 22303 Attn: CorporateSecretary Fax: 703/329-9409  11.  *Legend*.    Neither this Warrant nor the shares of common stock issuable upon exercise of this Warrant have been registered under the Securities Act of 1933, as amended, or under the securities lawsof any state. Neither this Warrant nor the shares of common stock 5 
 **FORM OF UNIT WARRANT** issued upon exercise of this Warrant may be sold, transferred, pledged or hypothecated in the absence of (i) an effective registration statement for this Warrant or the shares, as the case may be, under the SecuritiesAct of 1933, as amended, and such registration or qualification as may be necessary under the securities laws of any state, or (ii) an opinion of counsel reasonably satisfactory to the Company that such registration or qualification is not required.The Company shall cause a certificate or certificates evidencing all or any of the shares of common stock issued upon exercise of this Warrant prior to said registration and qualification of such shares to bear the following legend:  THE SHARES EVIDENCED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR UNDER THE SECURITIES LAWSOF ANY STATE. THE SHARES MAY NOT BE SOLD, TRANSFERRED, PLEDGED OR HYPOTHECATED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND SUCH REGISTRATION OR QUALIFICATION AS MAY BE NECESSARY UNDER THESECURITIES LAWS OF ANY STATE, OR A VALID EXEMPTION FROM REGISTRATION UNDER SUCH LAWS.  (c)  *Termination of Restrictions*.    The legend requirements of *Section 11* shall terminate when either (i) the security in question shall have been effectively registered under the Securities Actand disposed of pursuant thereto or (ii) the Company shall have received an opinion of counsel reasonably satisfactory to it that such legend is not required in order to insure compliance with the Securities Act.  12.  *Investment Covenant*.    The Holder by his or her acceptance hereof covenants that this Warrant is and anycommon stock issued hereunder will be acquired for investment purposes, and that the Holder will not distribute the same in violation of any state or federal law or regulation.  13.  *Amendments*.    The terms and provisions of this Warrant may not be modified or amended, or any provisions hereof waived, temporarily orpermanently, except by written consent of the Company and the Holder.  14.  *Successors andAssigns*.    This Warrant and the rights and duties of the Holder set forth herein may be assigned, in whole or in part, by the Holder. The obligations of the Company evidenced by this Warrant shall be binding upon itssuccessors, but neither this Warrant nor any of the rights or duties of the Company set forth herein shall be assigned by the Company, in whole or in part, without having first received the written consent of the Holder.  15.  *Governing Law*.    This Warrant shall be governed by, and construed in accordance with, the laws of theCommonwealth of Virginia without regard to the principles of conflicts of law thereof. 6 
 **FORM OF UNIT WARRANT** **IN WITNESS WHEREOF, the Company has caused this Warrant to be executed on its behalf and under its corporate seal as of the date first above written by one of its duly authorizedofficers and its execution hereof to be attested by another of its duly authorized officers.** Date:                    , 2001   HADRON, INc      By:         **Sterling E. Phillips, Jr.****President and Chief ExecutiveOfficer** Attested:   Print Name: Corporate Secretary7 
 **UNIT WARRANT** **ATTACHMENT A** **NOTICE OF EXERCISE** To:**    HADRON, INC.** (the “Company”)  The undersigned hereby irrevocably elects to exercise the right of purchase thereunder,              shares of Common Stock of the Company, as provided fortherein, and tenders herewith payment of the purchase price in full in the form of wire transfer, cash or a check in the aggregate amount of $            . If said number of shares shallnot be all the shares purchasable under the within Warrant, a new Warrant Certificate is to be issued in the name of said undersigned for the balance remaining of the shares purchasable thereunder less any fraction of a share paid in cash. Please issue a certificate or certificates for such shares of Common Stock in the name of, and pay any cash for any fractionalshare to:  Name: By: Signature:  **ASSIGNMENT**(To be executed only upon assignment of Warrant)  For value received,            , hereby sells, assigns and transfers unto              the within Warrant, together with all right, title andinterest therein, and does hereby irrevocably constitute and appoint              attorney, to transfer said Warrant on the books of the within-named Company, with full power ofsubstitution of the premises.  Dated:            , 20              By: