Cisco Connection Online 
Converter Clutch Override 
CAMECO 
Cancer Care Ontario 
Central Control Officer 
Chief of the Contracting Office 
Combat Cargo Officer 
Contract Change Order 
Catalogue of Cometary Orbits 
Central Compact Object 
Chief Compliance Officer 
Chief Counsel Office 
Chief of Combat Operations 
Circuit Control Office 
Circuit Control Officer 
Circuit Control Offices 
Classified Control Officer 
Close Combat Optic 
Component Coordinator 
Crystal Controlled Oscillator 
Calcium Cerium Oxide 
Calcium Cobalt Oxide 
Calcium Copper Oxide 
Campus Computing Organization 
Canyon change order 
cardiac output 
carotid occlusion 
Center for Career Opportunities 
Central Control Office 
channel catfish ovary