Amphibious Construction Battalion 
Annoyance Call Bureau 
Access Control Block 
American Council of the Blind 
Adjusted Cost Base 
Administrative Center Burlington 
Air Circuit Breaker 
Air Cushion Barge 
American Council for the Blind 
Architecture Control Board 
Army Classification Battery 
Association of Clinical Biochemists 
ATM Cell Bus 
Automatic Call Back 
ACcess Barred signal 
Accreditation of Certification Bodies 
accumbens 
accumbens nucleus 
accumbens septi 
Actinium B 
Actuarial Commandments Board 
Agent Communications Broker 
Air Campaign Branch 
Air Cavalry Brigade 
Air Combat Brigade 
Air Contigency Battalion 
Air Control Board 
aircrew bulletin 
air-operated circuit breaker 
Alberta Cancer Board