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The program focuses on Test as you Go, a design philosophy that NASA has used from the early days of Apollo. Components of a spacecraft are tested individually first, then later brought together for an integrated flight test.

Ares I-X launched on October 28, 2009, at 11:30 EDT (15:30 UTC) from Kennedy Space Center LC-39B, successfully completing a brief test flight. The vehicle's first stage ignited at T-0 seconds and Ares I-X lifted off from Launch Complex 39B. Ares I-X Flight Test Launches.