Operational Test Command
Officer in Tactical Command
Over the Counter
Operating Telephone Company
Over-the-Counter
Ozone Transport Commission
Operating Telefone Company
Orbiter Test Conductor
Operational Test Center
Overhead Trip Computer
Officer Training Corps
Official Test Centre
Online Training Center
Ouachita Technical College
oxytetracycline
Occupational Training Center
Ocean Thermal Conversion
ochratoxin C
odor threshold concentration
off the case
Office for Topography and Cartography
Office of Technology Commercialization
Office of Treaty Compliance
OFFICE TECHNOLOGY CENTER
Officers' Training Corp
Officers Training Corps
Offshore Technology Conference
offsite training center
Off-Track Capability
Okehampton Town Council
Old Table Control
On Tape Catalog
On Top Carriers
Once-Through Cooling
One Time Charge
One-Time Charge
Onsite Transfer Cask
Ontario Technology Corridor
open tubular column
open-top chambers