Audio on Demand 
aerosol optical depth 
argon oxygen decarburization 
Argon-Oxygen Decarbonization 
Acousto-Optic Device 
Administrator on Duty 
Advanced Optical Disc 
Aircraft Operations Division 
Analog Output Differential 
Aortic dissection 
Army Ordnance Department 
Assistant Operations Director 
Above Ordnance Datum 
Academy of Operative Dentistry 
accumulated oxygen deficit 
Acoustic-Optics Devices 
Act of Duty 
Actions on Decisions 
Administrative Officer of the Day 
Advance Ordnance Depot 
Advanced Optical Disk 
Advanced Ordnance Deport 
Advertising On Demand 
age of dam 
Age of Data 
Air Operations Directive 
airway obstructive disease 
airway obstructive diseases 
Alcohol and Other Drug Thesaurus 
alcohol and other drugs