Space Shuttle Discovery STS-39 was the 12th mission of the Space Shuttle Discovery Program. Its purpose was to conduct a variety of payload experiments for the Department of Defense and was launched on April 28, 1991 on an 8 day mission. Here is April 28, 1991 First Day Issue Cache with the Discovery symbol and released from Nassau Bay, Houston Texas 77058. Also included is a dynamic First Day Issue Celebration Cache with a large Discovery Logo, original “Benefiting Mankind” original postage stamp dedicated to Discovery, their logo large stamp: The Spacecraft for Orbit..It Came From Downey. This is signed by all of the crew: Commander Michael Coats, Pilot L. Blaine Hammond, Mission Specialist Gregory Harbaugh, Donald McMonagle, Guion Bluford, Charles Veach and Richard Hieb. Within the cache is a full description of the mission and the crew.