TLS signed “Leroy G. Cooper, Jr.,” one page, 8 x 10, Project Mercury letterhead, no date. Letter to Mr. & Mrs. Ken Browne, in part: "Please accept my apology for having been so delinquent with my reply but, as you can imagine, our training program has kept us quite busy these past few months. My correspondence has, of necessity, had to take a back seat…Project Mercury is just now getting underway actually and everyone concerned with the project will be quite busy during the coming months." In fine condition.Format: TLS