American College of Radiology 
Allowed Cell Rate 
Armored Cavalry Regiment 
Active Cavity Radiometer 
Anonymous Call Rejection 
Advanced Communication Riser 
aerodrome control radar 
Allowance Change Request 
Attenuation to Crosstalk Ratio 
Automatic Call Recording 
Advanced Concepts and Requirements 
Alternate Carrier Routing 
Attenuation Crosstalk Ratio 
Available Cell Rate 
Abandon Call and Retry 
Absolute Category Rating 
Advanced Cracking Reactor 
Airfield Control Radar 
Allowance Change Requests 
Audio Cassette Recorder 
Absolute Cryogenic Radiometer 
Access Control Register 
acrylic 
Active Cavity Radar 
Actual Cost Report 
Adjusted Community Rating 
Advanced Combat Rifle 
Advanced converter reactor 
Advisory Committee for Research 
Aerial Cable Range