On January 27, 1967, a fire swept through the Apollo 1 Command Module during a launch rehearsal test, killing all three astronauts on board: Virgil I. “Gus” Grissom, Edward H. White, and Roger B. Chaffee. The cause of the fire was a spark from a short circuit in a bundle of wires that ran to the left and just in front of Grissoms seat. The large amount of flammable material in the cabin in the oxygen environment allowed the fire to start and spread quickly. The mission, originally designated Apollo 204 but commonly referred to as Apollo 1, was officially assigned the name "Apollo 1" in honor of the crew. The tragedy led to an exhaustive investigation, and changes were made to the Apollo Command Module as a result of the tragedy, resulting in a highly reliable craft which, with the exception of Apollo 13, helped make the complex and dangerous trip to the Moon almost commonplace. The Apollo 1 Command Module capsule 012 was impounded and studied after the accident and was then locked away in a storage facility at NASA Langley Research Center. The eventual success of the Apollo program is a tribute to the three astronauts whose tragic loss was not in vain.