This undated photo made available by NASA shows the Apollo 1 crew, from left, Edward H. White II, Virgil I. "Gus" Grissom, and Roger B. Chaffee. On Jan. 27, 1967, a flash fire erupted inside their capsule during a countdown rehearsal, with the astronauts atop the rocket at Cape Canaveral’s Launch Complex 34. All three were killed. (NASA via AP)
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