USMP-4 means United States Micro-gravity Payload-4 in
NASA
Similar to USMP-4
A&P - Attitude and Pointing
A&PS - Administration and Program Support
MSFC Directorate
A&R - Automation and Robotics
A&RC - Application and Resource Control
A&TA - Assembly and Test Area
A&V - Assembly and Verification
A/A - Air to Air
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