Exhibit 17.4

Bruce J. Stewart

8924 Belmart Road

Potomac, MD 20854

August 16, 2006

VIA FACSIMILE 703-729-7372

Therese Hathaway, Esq.

Corporate Secretary

Telos Corporation

19886 Ashburn Road

Ashburn, VA 20147

Dear Ms. Hathaway:

I am writing to inform Telos Corporation that I hereby resign from the Telos Corporation board of directors, effective immediately.

Sincerely,

Bruce J. Stewart

cc: Geoffrey B. Baker

David Borland

Norman P. Byers

Robert J. Marino

Langhorne A. Motley

Thomas L. Owsley

Malcolm M. B. Sterrett

John B. Wood