200 ARS definitions

Agricultural Research Service 
Automatic Route Selection 
Air Rescue Service 
Automatic Restraint System 
Adaptive Receptive System 
American Rocket Society 
Army Regulations 
Assignment Requests 
Action Request System 
Alternate Route Selection 
Access Routers 
acute radiation syndrome 
Advanced Reconnaissance Satellite 
Advanced Record System 
Advanced Recovery System 
Air Reserve Station 
Air Revitalization System 
amplified response spectrum 
Atmosphere Revitalization System 
Attitude Reference System 
Accruals Reporting System 
Active Repeater Satellite 
acute radiation sickness 
Adult Reye's syndrome 
advance record system 
Advanced Reconnaissance System 
Aerial Reconnaissance and Surveillance 
aerial refueling store 
Agriculture Research Service 
Air Refueling Squadron 
Air Rescue Science 
Air Rescue Squadron 
Airborne Receiving System 
alizarin red S 
American Radium Society 
American Rhinologic Society 
Archive and Retrieval Subsystem 
Argentine Peso 
arylsulfatase 
Asbestos Roof Shingle