PFRX means Preflight Relmat X-1,2,3...9 or A,B,C...Z in NASA
Similar to PFRX
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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