CAMECO 
Catalogue of Cometary Orbits 
Central Control Officer 
Cisco Connection Online 
Combat Cargo Officer 
contract change order 
Current-Controlled Oscillator 
Central Compact Object 
Chief Compliance Officer 
Chief Counsel Office 
Circuit Control Office 
Classified Control Officer 
Close Combat Optic 
Crystal Controlled Oscillator 
Calcium Cerium Oxide 
Calcium Cobalt Oxide 
Calcium Copper Oxide 
Campus Computing Organization 
Cancer Care Ontario 
Canyon change order 
cardiac output 
carotid occlusion 
channel catfish ovary 
chargeable cost objective 
Chicago Condors 
Chief Combat Operations 
Chief Competitive Officer 
Chief Conservation Officer 
Chief Content Officer 
Chief Customer Officer