Advanced Resolution Technology 
Adaptive Resonance Theory 
Army Regional Tools 
Automated Reasoning Tool 
advanced reasoning tool 
Advanced Registry Tracer 
Advanced Reusable Technology 
alarm response team 
Arab Radio and Television 
Artificial 
ATM Router Task 
AUTOMATIC REPORTING TELEPHONE 
Average Response Time 
Acoustic Resonance Testing 
ACTIVE REFERENCE TABLE 
Active Repair Time 
Adaptive Resonanse Theory 
Advanced Reactors Transition 
Advanced Recognition Technologies 
Advanced Rendering Tools 
aerosol release and transport 
Airborne Radio Transmitters 
Airspace Regulation Team 
Alert Readiness Test 
Alternative Routing To 
Amplitude Radio Transmission 
Analysis and Reporting Tool 
Another Ray Tracer 
anticipatory reactor trip 
Asset Reconciliation Tool