Abort Guidance System 
Advanced Gun System 
Alliance Ground Surveillance 
Armored Gun System 
alternating-gradient synchrotron 
Air Guard Station 
Alternating Gradient Synchrotron 
Application Generation Software 
adrenogenital syndrome 
Advanced Geosynchronous Studies 
Advanced Gimbal System 
Advanced Gun Systems 
Air Gunners School 
Aircraft Generation Squadron 
ALTERNATING GRADIENT SYNCHOTRON 
alternating gradient synchroton 
American Geographical Society 
American Geriatrics Society 
Analysis Ground Station 
annulus gas system 
Army General Staff 
Associate in General Studies 
Australian Government Solicitor 
Automatic Gain Stabilization 
Surveying Ship 
A/G system 
Abort Guidance Subsystem 
Acoustic Geolocation Sensor 
acute grass sickness 
Advanced Genetic Sciences