Exhibit 99.1

Annex A

November ___, 2020

McKean Defense Group, Inc.
One Crescent Drive, Suite 400
Philadelphia, Pennsylvania 19112

Ladies and Gentlemen:

McKean Defense Group, Inc. (“Parent”), Gyro Merger Sub Inc., a wholly-owned subsidiary of Parent (“Merger Sub”), and Mikros Systems Corporation (the “Company”) desire to enter into, concurrently with or following the execution of this letter agreement (this “Agreement”), an Agreement and Plan of Merger (as the same may be amended from time to time, the “Merger Agreement”), pursuant to which, among other things, the Company will merge with and into Merger Sub with the Company surviving the merger (the “Merger”) pursuant to the terms and conditions of the Merger Agreement. Defined terms used but not otherwise defined herein shall have the meanings ascribed to them in the Merger Agreement.

Parent has required that, as a condition to its willingness to enter into the Merger Agreement, the undersigned shareholder of the Company execute and deliver to Parent this Agreement.

The undersigned, in order to induce Parent to enter into the Merger Agreement, hereby irrevocably (in his or her individual capacity and not as a director or officer of the Company):

(a) represents and warrants to Parent that (i) the undersigned (A) beneficially owns (as such term is defined in Rule 13d-3 under the Exchange Act all of the shares of the Company Common Stock set forth below on the signature page hereto (the “Original Shares” and, together with any additional shares of the Company Common Stock pursuant to paragraph (d) below, the “Shares”) (provided that the term “Shares” shall not include any securities beneficially owned by the undersigned as a trustee or fiduciary) free and clear of all Liens, (B) does not beneficially own any shares of the Company Common Stock other than the Original Shares, and (C) has the capacity to enter into this Agreement and that this Agreement is a valid and binding obligation enforceable against the undersigned in accordance with its terms, subject to bankruptcy, insolvency and other Laws affecting creditors’ rights and general equitable principles, (ii) except pursuant hereto, there are no options, warrants or other rights, agreements, arrangements or commitments of any character to which the undersigned is a party relating to the pledge, disposition or voting of any of the Original Shares and there are no voting trusts or voting agreements with respect to the Original Shares, (iii) neither the execution and delivery of this Agreement or the consummation by the undersigned of the transactions contemplated hereby will conflict with or result in a breach, or constitute a default (with or without notice of lapse of time or both) under any provision of, any trust agreement, loan or credit agreement, mortgage, lease or other agreement, instrument or applicable Law applicable to the undersigned or to the undersigned’s property or assets, and (iv) no consent, approval or authorization of any other party is required in order for the undersigned to enter into and perform his or her obligations under this Agreement;

(b) agrees, and agrees to use best efforts to cause any other record owner of the Shares, to (i) be present (in person or by proxy) at all the Company Stockholders’ Meetings in order to be counted for the purpose of determining the presence of a quorum at such meetings, and (ii) vote or cause to be voted all such Shares (A) in favor of approval and adoption of the Merger, the Merger Agreement and the transactions contemplated thereby (including any amendments or modifications of the terms thereof approved by the Company Board), and (B) against (x) any Company Takeover Proposal, including a Superior Company Proposal, (y) any action, proposal, transaction or agreement which could reasonably be expected to result in a breach of any covenant, representation or warranty or any other obligation or agreement of the Company under the Merger Agreement or of the undersigned under this Agreement and (z) any action, proposal, transaction or agreement that could reasonably be expected to impede, interfere with, delay, discourage, adversely affect or inhibit the timely consummation of the Merger or the fulfillment of Parent’s or the Company’s conditions under the Merger Agreement;

(c) agrees that (i) the undersigned will not, directly or indirectly, contract to sell, sell, exchange, assign, pledge or otherwise dispose of or encumber (“Transfer”) any of the Shares or any interest therein or any voting rights with respect thereto, other than to any immediate family member of the undersigned, or to a trust for the benefit of the undersigned or his or her immediate family member or upon the undersigned’s death; provided that, as a precondition to such permitted Transfer, the transferee has agreed in writing to abide by the terms of this Agreement in a form reasonably satisfactory to Parent, and (ii) any attempted Transfer of the Shares or any interest therein in violation of this paragraph (c) by the undersigned shall be null and void; and

(d) agrees that all shares of the Company Common Stock that the undersigned purchases, acquires the right to vote or otherwise acquires beneficial ownership (as defined in Rule 13d-3 under the Exchange Act) of after the execution of this Agreement shall be subject to the terms of this Agreement and shall constitute Shares for all purposes of this Agreement.

________________________

It is understood and agreed that the provisions of this Agreement relate solely to the capacity of the undersigned as a shareholder or other beneficial owner of shares of the Company Common Stock and is not in any way intended to affect the exercise by the undersigned of the undersigned’s responsibilities, rights or duties as a director or officer of the Company. It is further understood and agreed that this Agreement is not in any way intended to affect the exercise by the undersigned of any fiduciary responsibility which the undersigned may have in respect of any shares of the Company Common Stock held or controlled by the undersigned as of the date hereof.

The obligations set forth in this Agreement shall terminate upon the earliest to occur of (i) the Effective Time and (ii) the date on which the Merger Agreement is terminated in accordance with its terms.

This Agreement may be executed in two or more counterparts, each of which shall be deemed to constitute an original, but all of which together shall constitute one and the same Agreement. Each party hereto shall execute and deliver such additional documents as may be necessary or desirable to effect the transactions contemplated by this Agreement.

This Agreement shall inure to the benefit of Parent, shall be binding on the undersigned and his or her executors, personal representatives, administrators, heirs, legatees, guardians and other personal representatives, and may not be assigned by any party without the written consent of the other. This Agreement shall survive the death or incapacity of the undersigned.

If any term or provision of this Agreement is invalid, illegal or unenforceable in any jurisdiction, such invalidity, illegality or unenforceability shall not affect any other term or provision of this Agreement or invalidate or render unenforceable such term or provision in any other jurisdiction. Upon such determination that any term or other provision is invalid, illegal or unenforceable, the parties hereto shall negotiate in good faith to modify this Agreement so as to effect the original intent of the parties as closely as possible in a mutually acceptable manner in order that the transactions contemplated hereby be consummated as originally contemplated to the greatest extent possible.

The undersigned agrees that, in the event of his or her breach of this Agreement, Parent shall be entitled to such remedies and relief against the undersigned as are available at Law or in equity. The undersigned acknowledges that there is not an adequate remedy at Law to compensate Parent for a violation of this Agreement, and irrevocably waives, to the extent permitted by Law, any defense that he or she might have based on the adequacy of a remedy at Law which might be asserted as a bar to specific performance, injunctive relief, or other equitable relief. The undersigned agrees to the granting of injunctive relief without the posting of any bond and further agrees that, if any bond shall be required, such bond shall be in a nominal amount.

[Signature page follows]

Please confirm, intending to be legally bound, that the foregoing correctly states the understanding between the undersigned and Parent by signing and returning to Parent a counterpart hereof.

Very truly yours,

Name:____________________________

Number of Shares: ____________

Accepted as of this ___ day of November 2020:

MCKEAN DEFENSE GROUP, INC.

By: ____________________________

Name:

Title: