USMP-4 means United States Micro-gravity Payload-4 in NASA
Similar to USMP-4
ACE - Advanced Composition ExplorerACE - Apollo Checkout Equipment
ACES - Acoustic Containerless Experiment System
ACF - Auto- Correlation Function
ACFS - Advanced Concepts Flight Simulator
ACFY - After the Current Fiscal Year
ACIO - Agency Chief Information Officer
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