Office Automation Technology and Servi… 
Officers Advanced Training School 
Open Area Test Site 
Optical Alignment Transfer System 
Options Automated Trading System 
orbit and attitude tracking system 
Obligations Assimilables du Trésor 
Office Automation and Technology Servi… 
Office Automation Technology and Servi… 
Online AIF Transaction System 
Online Allowance Transfer System 
Open Air Test Site 
Operation Assignments Tracking System 
Operations Analysis for Tactical Suppo… 
Optical Attenuation Test Set 
OPTICAL ATTITUDE TRANSFER SYSTEM 
Optional Application Tapes 
Orbiter Avionics Tracking System 
Order Audit Trail System 
Organic anion transporters 
Original Article Tearsheet Service 
osteochondral autograft transfer syste… 
Over-the-Air Activation TeleService 
Oxford Air Training School 
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