can refer to:
In the :
- Chief Warrant Officer , the most senior Army and Air Force non-commissioned member (NCM) rank of the Canadian Forces
- Chief Petty Officer , a noncommissioned officer or equivalent in many navies
- Chief Of The Boat , the senior enlisted sailor on a submarine in the US Navy
- Chieftain Tank , FV 4201 Chieftain, the main battle tank of the UK during the 1960s and 70s
In :
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