Chief Security Officer 
Cognizant Security Office 
Competitive Sourcing Official 
Chief Signal Officer 
Committee of Senior Officials 
Cognizant Security Offices 
Combat Systems Officer 
communications support organization 
Court Security Officer 
Customer Service Office 
Chief Signals Officer 
Chief Strategy Officer 
Chief Sustainment Officer 
Clothing and Services Office 
Clothing Services Office 
Cognizant Secretarial Office 
Command Security Office 
Command Security Officer 
Communication Service Order 
Communications Service Order 
Communications-Computer Systems Office… 
Company Security Officer 
Composite Second Order Distortion 
Computer Systems Operation 
Computer Systems Organization 
Curvature of the Second Order