| Abbreviation | Definition |
|---|---|
| COA | Course Of Action |
| COAA | Course-Of-Action Analysis |
| COAD | Continue On Active Duty |
| COAS | Chief of Army Staff |
| COAS | Chief of Army Staff (Pakistan) |
| COAS | Chief of the Army Staff |
| COAST | Controller's Assistant |
| COAST | Course Of Action Support Tool |
| COAX | CO-AXial (cable) |
| COB | Chief Of the Boat |
| COB | Chief On Board |
| COB | Civilian On the Battlefield |
| COB | Collocated Operating Base |
| COB | Co-Located Operating Base |
| COB | Command Operating Budget |
| COB | Contingency Operating Base |
| COBC | Chemical Officer Basic Course |
| COBE | Command Operating Budget Estimate |
| COBRA | Coastal Battlefield Reconnaissance and Analysis |
| COBRA | Combat Outcome Based on Rules for Attrition |