Advanced Technology Demonstration 
Actual Time of Departure 
Automation and Technology Division 
Advanced Technology Development 
Asynchronous Time Division 
Atmospheric Technology Division 
Advanced Technology Demonstrations 
Advanced Technology Demonstrator 
Advanced Technology Division 
AUTO PRIDE 
Aerospace Technology Division 
Air and Toxics Division 
Along Track Distance 
Alternate Turbopump Development 
Alzheimer type dementia 
Applied Technology Division 
astronaut translation device 
Attention Dial the phone 
Automatic Transfer Device 
Automatic Turbopump Development 
abdominal transverse diameter 
Acceptance and Takeover Date 
Acctual Time of Departure 
Acute tryptophan depletion 
Adult Training Diploma 
Advanced Tank Technologies 
Advanced Technical Device 
Advanced Trial Dog 
Aerotours Dominicana 
Aided Target Detection