Exhibit 10.19

                                                              ____________, 2006

Vector Intersect Security
65 Challenger Road
Ridgefield Park, New Jersey 07660

Rodman & Renshaw LLC
1270 Avenue of the Americas
New York, NY 10020

          Re: Initial Public Offering

Gentlemen:

          The undersigned stockholder of Vector Intersect Security Acquisition
Corp. ("Company"), in consideration of Rodman & Renshaw LLC ("Rodman") entering
into an agreement to underwrite an initial public offering of the securities of
the Company ("IPO") and embarking on the IPO process, hereby agrees as follows
(certain capitalized terms used herein are defined in paragraph 12 hereof):



          1. If the Company solicits approval of its stockholders of a Business
Combination, the undersigned will vote all Insider Shares and Placement Shares
owned by it and all shares of Common Stock of the Company acquired by it in the
IPO (the "IPO Shares") or aftermarket in favor of the Business Combination. The
undersigned will not exercise any statutory appraisal rights to which the
undersigned may be entitled under Section 262 of the Delaware General
Corporation Law (the "GCL") in connection with any Business Combination with
respect to any Insider Shares, Placement Shares IPO Shares or any shares
acquired by it in the aftermarket.

          2. In the event that the Company fails to consummate a Business
Combination within 18 months from the effective date ("Effective Date") of the
registration statement relating to the IPO or 24 months under the circumstances
described in the prospectus relating to the IPO (such later date being referred
to herein as the "Termination Date"), the undersigned shall vote its shares in
favor of any plan of dissolution and distribution recommended by the Company's
board of directors The undersigned hereby waives any and all right, title,
interest or claim of any kind in or to any distribution of the Trust Fund and
any remaining net assets of the Company as a result of such liquidation with
respect to all shares of Common Stock then owned by it, including without
limitation, its Insider Shares, its Placement Shares, its IPO Shares and any
shares acquired by the undersigned in the aftermarket ("Claim") and hereby
waives any Claim the undersigned may have in the future as a result of, or
arising out of, any contracts or agreements with the Company and will not seek
recourse against the Trust Fund for any reason whatsoever.

          3. In order to minimize potential conflicts of interest which may
arise from multiple affiliations, the undersigned agrees to present to the
Company for its consideration, prior to presentation to any other person or
entity, any suitable opportunity to acquire a Target Business, until the earlier
of the consummation by the Company of a Business Combination, the liquidation of
the Company or until such time as the undersigned ceases to be a director of the
Company, subject to any pre-existing fiduciary and contractual obligations the
undersigned might have.

          4. The undersigned acknowledges and agrees that the Company will not
consummate any Business Combination which involves a company which is affiliated
with any of the Insiders.

          5. Neither the undersigned, nor any affiliate ("Affiliate") of the
undersigned will be entitled to receive and will not accept any compensation for
services rendered to the Company prior to the consummation of the Business
Combination except in connection with bona fide services to be rendered to the
Company that (i) are expressly approved by a majority of the Company's
disinterested directors and copies of detailed invoices describing the services
rendered are delivered to the Company and the performance thereof is accurately
documented by the undersigned, any member of the family of the undersigned, nor
any Affiliate, (ii) are legitimately required by the Company and the Company
would otherwise contract such services from a third party, and (iii) are
determined on an arm's length basis and in good faith and such fees and
compensation are customarily charged by unrelated third party service providers
of a


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similar nature. Notwithstanding the foregoing to the contrary, the undersigned
shall be entitled to reimbursement from the Company for its reasonable
out-of-pocket expenses incurred in connection with identifying, investigating
and consummating a Business Combination and the undersigned acknowledges that
Selway Partners LLC, an affiliate of the Company's President and Chief Executive
Officer and the Company's Executive Vice President and Secretary ("Related
Party"), shall be allowed to charge the Company up to $7,500 per month to
compensate it for the Company's use of Related Party's office space and certain
administrative, technology, bookkeeping and secretarial services.

          6. Neither the undersigned nor any Affiliate of the undersigned will
be entitled to receive or accept a finder's fee or any other compensation in the
event the undersigned or any Affiliate of the undersigned originates a Business
Combination.

          7. The undersigned will escrow its Insider Shares until the earliest
of (i) the date which is one year after the date on which the Company
consummates its initial Business Combination, (ii) the date on which any
Business Combination consummated by the Company results in a Change of Control
of the Company or (iii) the date on which the Company receives the approval of
the holders of not less than a majority of the outstanding shares of the
Company's Stock to a release of its Insider Shares from the escrow established
in accordance with the terms of a Stock Escrow Agreement which the Company will
enter into with the undersigned, certain other holders of the Company's Common
Stock and American Stock Transfer & Trust Company, as escrow agent.

          8. The undersigned represents and warrants that:

          (a) it is not subject to or a respondent in any legal action for, any
injunction, cease-and-desist order or order or stipulation to desist or refrain
from any act or practice relating to the offering of securities in any
jurisdiction;

          (b) it has never been convicted of or pleaded guilty to any crime (i)
involving any fraud or (ii) relating to any financial transaction or handling of
funds of another person, or (iii) pertaining to any dealings in any securities
and he is not currently a defendant in any such criminal proceeding; and

          (c) it has never been suspended or expelled from membership in any
securities or commodities exchange or association or had a securities or
commodities license or registration denied, suspended or revoked.

          9. The undersigned has full right and power, without violating any
agreement by which it is bound, to enter into this letter agreement.

          10. The undersigned authorizes any employer, financial institution, or
consumer credit reporting agency to release to Rodman and its legal
representatives or agents (including any investigative search firm retained by
Rodman) any information they may have about the undersigned's background and
finances ("Information"). Neither Rodman nor its agents shall be violating the
undersigned's right of privacy in any


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manner in requesting and obtaining the Information and the undersigned hereby
releases them from liability for any damage whatsoever in that connection.

          11. This letter agreement shall be governed by and construed and
enforced in accordance with the laws of the State of New York, without giving
effect to conflicts of law principles that would result in the application of
the substantive laws of another jurisdiction. The undersigned hereby (i) agrees
that any action, proceeding or claim against him arising out of or relating in
any way to this letter agreement (a "Proceeding") shall be brought and enforced
in the courts of the State of New York of the United States of America for the
Southern District of New York, and irrevocably submits to such jurisdiction,
which jurisdiction shall be exclusive, (ii) waives any objection to such
exclusive jurisdiction and that such courts represent an inconvenient forum and
(iii) irrevocably agrees to appoint Loeb & Loeb LLP as agent for the service of
process in the State of New York to receive, for the undersigned and on his
behalf, service of process in any Proceeding. If for any reason such agent is
unable to act as such, the undersigned will promptly notify the Company and
Rodman and appoint a substitute agent acceptable to each of the Company and
Rodman within 30 days and nothing in this letter will affect the right of either
party to serve process in any other manner permitted by law.

          12. As used herein, (i) a "Business Combination" shall mean an
acquisition by merger, capital stock exchange, asset or stock acquisition, or
other similar business combination with one or more Target Businesses having a
fair market value of at least 80% of the Company's net assets at the time of
such acquisition; (ii) "Change of Control" shall mean a consolidation or merger
involving the Company where the stockholders of the Company immediately prior to
such transaction hold less than 50% of the voting stock of the surviving entity;
(iii) Common Stock" shall mean the Company's Common stock, par value $.001 per
share; (iv) "Insiders" shall mean all officers, directors and stockholders of
the Company immediately prior to the Private Placement; (v) "Insider Shares"
shall mean all of the shares of Common Stock of the Company owned by an Insider
prior to the Private Placement; (vi) "IPO Shares" shall mean the shares of
Common Stock issued in the Company's IPO; (vii) "Private Placement" shall mean
the private placement of securities of the Company consummated immediately prior
to the IPO; (viii) "Private Placement Shares" shall mean the shares of Common
Stock issued in the Private Placement; (ix) "Target Business" shall mean an
operating business based either in the United States or abroad that conducts
business in the homeland security national security and/or command an control
industries or a business relating to the manufacture of products for use in such
industries; and (x) "Trust Fund" shall mean the trust account established by the
Company at the consummation of its IPO and into which a certain amount of the
net proceeds of the IPO is deposited.

                                        SCP PRIVATE EQUITY MANAGEMENT COMPANY,
                                        LLC


                                        By:
                                            ------------------------------------
                                        Name:
                                        Title:


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