Beskrivning : 2 covers. Houston special post stamp for the 25th anniversary of Apollo One tragedy.
The planned low Earth orbital test of the Apollo Command/Service Module never made its target launch date of February 21, 1967, because a cabin fire during a launch rehearsal test on January 27 at Cape Canaveral Air Force Station Launch Complex 34 killed all three crew members-Command Pilot Virgil I. "Gus" Grissom, Senior Pilot Edward H. White II, and Pilot Roger B. Chaffee-and destroyed the Command Module (CM).