The mobile service tower is retracted from the Delta 4-Heavy rocket and Orion spacecraft for Exploration Flight Test 1.
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Delta 4
Video: Orion flight preps

Mission Reports
Facing more delays, NASA opens door to launching lunar mission with commercial rockets
In a major shift, NASA is considering using two commercial launchers to send an unpiloted Orion crew capsule and its European-built service module on a test flight around the moon next year, maintaining the lunar test flight’s schedule despite fresh delays in the development of the multibillion-dollar Space Launch System that jeopardize the heavy-lifter’s 2020 inaugural flight, the agency’s administrator said in a congressional hearing Wednesday.