Office of Acquisition Management 
Operation and Maintenance 
Operations and Maintenance 
Operation Administration and Maintenan… 
Operation Animal Mutilation 
Operations and Management 
Off-Air Monitoring 
Office of Administrative Management 
Office of Aviation Management 
Operations Administration and Maintena… 
optical absorption microscope 
Object Access Model 
Object Allocation Map 
Object Attribute Memory 
Object Authority Manager 
Observatorio Astronómica de Madrid 
Oceanic Angular momentum 
Office Administration Manual 
Office of Administration and Managemen… 
Office of Aerospace Medicine 
Office of Alternative Medicine 
Office of Aquisition Management 
Office of Asset Management 
On Aircraft or Missile 
Once-a-Month 
Ontario Agricultural Museum 
Operation, Administration and Maintena… 
Operation, Administration, Management 
Operations Administration and Manageme… 
Operations, Administation, and