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Orbiter Project Schedule
in NASA
OPerational Sequence
in NASA
Oxygen Purge System
in NASA
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Similar to OPS
A/E - Architectural and Engineering
A/E - Activity Elements
A/F - Air-to-Fuel Ratio
A/FM - Air/Firing Mechanism
A/G - Air to Ground
A/L - AutoLand
A/L - AirLock
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