- all hands - entire ship's company or unit personnel, including all officers and enlisted personnel
- as you were - order to disregard the immediately-preceding order
- aye-aye - Navy term, meaning you understand the orders given and will carry them out
- billet - one's rank or task in a unit
- brig - Military prison on ship or ashore.
- bulkhead - wall
- carry on - order to continue after being interrupted.
- charlies - The service "C" uniform, consisting of the short-sleeve khaki shirt and green trousers.
- chit - voucher, receipt, letter, or note.
- Chow - Food
- Chow hall - Cafeteria
- civvies - civilian clothing
- deck - floor or surface of the earth
- Devil Dog - nickname for Marines, from the German word "Teufelhunden", supposedly given by German troops at the Battle of Belleau Wood
- DI - Drill Instructor, inappropriate to use the Army term "drill sergeant".
- field day - day or portion of day set aside for top-to-bottom cleaning of an area; also as a verb for the act of conducting a field day.
- guide - unit Guidon-bearer
- hatch - door
- head - Bathroom
- Irish pennant or IP - loose thread, string, or strap on a uniform or equipment that detracts from a perfect appearance.
- leatherneck - nickname for Marine, so named for legends stating that stiff leather collars were once worn to protect the throat from sword-blows
- mess hall - cafeteria
- quarter deck - a location of prominence in a barracks or office
- quatrefoil - four-pointed embroidered pattern stitched on to the top of a Marine officer's barracks cover, from the tradition of wearing it to be identified as friendly to Marine sharpshooters during boarding actions in the era of wooden sailing ships.
- rack - bed
- scrambled eggs - gold oak leaf embroidery found on an officer's barracks cap visor and mess dress cuffs
- secure - stop, cease; or put away and lock