Exhibit 3.1

RESTATED CERTIFICATE OF INCORPORATION
OF
GLOBAL DEFENSE TECHNOLOGY & SYSTEMS, INC.

April 4, 2011

ARTICLE I

The name of the corporation (the “Corporation”) is Sotera Defense Solutions, Inc.

ARTICLE II

The address of the Corporation’s registered office in the State of Delaware is in New Castle County, at 1209 Orange Street, Wilmington, Delaware 19801. The name of the registered agent at such address is The Corporation Trust Company.

ARTICLE III

The purpose of the Corporation is to engage in any lawful act or activity for which corporations may be organized under the General Corporation Law of the State of Delaware.

ARTICLE IV

The total number of shares of all classes of stock that the Corporation shall have authority to issue is 1,000 shares of Common Stock having the par value of $0.01 per share.

ARTICLE V

The number of directors of the Corporation shall be fixed from time to time by the Board of Directors of the Corporation.

ARTICLE VI

In furtherance and not in limitation of the powers conferred upon it by law, the Board of Directors of the Corporation is expressly authorized to adopt, amend or repeal the Bylaws of the Corporation.

ARTICLE VII

Unless and except to the extent that the Bylaws of the Corporation so require, the election of directors of the Corporation need not be by written ballot.

ARTICLE VIII

1. To the fullest extent from time to time permitted by law, no director of the Corporation shall be personally liable to any extent to the Corporation or its stockholders for monetary damages for breach of his fiduciary duty as a director. If the General Corporation Law of the State of Delaware (the “DGCL”) is amended to authorize corporate action further eliminating or limiting the personal liability of directors, then the liability of a director of the Corporation shall be eliminated to the fullest extent permitted by the DGCL, as so amended.

2. The Corporation shall indemnify, to the fullest extent permitted by applicable law, any director or officer of the Corporation who was or is a party or is threatened to be made a party to any threatened, pending or completed action, suit or proceeding, whether civil, criminal, administrative or investigative (a “Proceeding”) by reason of the fact that he or she is or was a director, officer, employee or agent of the Corporation or is or was serving at the request of the Corporation as a director, officer, employee or agent of another corporation, partnership, joint venture, trust or other enterprise, including service with respect to employee benefit plans, against expenses (including attorneys’ fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by such person in connection with any such Proceeding. The Corporation shall be required to indemnify a person in connection with a Proceeding initiated by such person only if the Proceeding was authorized by the Board of Directors.

3. Neither any amendment or repeal of any Section of this Article VIII, nor the adoption of any provision of this Restated Certificate of Incorporation inconsistent with this Article VIII, shall eliminate or reduce the effect of this Article VIII in respect of any matter occurring, or any action or proceeding accruing or arising or that, but for this Article VIII, would accrue or arise, prior to such amendment, repeal or adoption of an inconsistent provision.

ARTICLE IX

Each person who is or was or had agreed to become a director or officer of the Corporation, and each such person who is or was serving or who had agreed to serve at the request of the Corporation as a director, officer, partner, member, employee or agent of another corporation, partnership, limited liability company, joint venture, trust or other enterprise (including the heirs, executor, administrators or estate of such person), shall be indemnified and advanced expenses by the Corporation to the fullest extent permitted from time to time by applicable law. Any repeal or modification of this Article IX shall not adversely affect any right to indemnification of any person existing at the time of such repeal or modification with respect to any matter occurring prior to such repeal or modification.