W
- walking john – nickname for a Marine marching in dress blues uniform that appeared on World War I-era recruiting posters.
- WAM – Wide Assed Marine. A derogatory term used for female members of the Corps.
- war belt – a web belt used to carry canteens in pouches and other miscellaneous equipment.
- war paint – camouflage face paint.
- watch – formal tour of duty of prescribed length, usually a guard-related task.
- water buffalo or water bull – 400-gallon potable water tank, trailer-mounted, towed behind a truck.
- wetting-down or wet down – celebration in honor of one's promotion as an officer or to the SNCO ranks, so named for the tradition of wetting the recipient and/or the promotion warrant.
- whiskey locker — supply locker/closet.
- whiskey tango - White trash
- whites – Marine Corps or Navy white dress uniforms.
- WP or Willie Pete – White Phosphorus munition, whether in grenade, mortar, artillery, or aerial bomb form, so named from the pre-1956 phonetic alphabet letters "William" and "Peter."
- wilco – voice procedure term shortened from "Will Comply".
- willie peter bag – waterproof bag.
- wing wiper – aviation person, usually a maintenance person and not a pilot.
- winger – aviation Marine.
- WIR – DRMO; Washed-out In Repair; waste incidental to reprocessing; collection of items and/or equipment for turn-in that may be re-used by someone else at a later time, preferably at a savings to the government.
- the wire – defensive perimeter of a firm base, crossing it denotes the end of relative safety.
- wookie – Female Marine, See WM.
- wooly pully or itchy bitchy – green wool sweater worn with the service uniform (or blue with the dress uniform) over the khaki shirt.
- word – general term for instructions, orders, and information that is required for all members of a unit to know; or the act of passing information to a collected group of servicemembers. See also gouge.
- WM – Walking Mattress/Woman Marine, usually considered an offensive term.
- work your bolt – resort to special measures, either by energy or guile, in order to attain a particular end; from the action of racking a rifle's bolt to clear a stoppage.
Read more about this topic: List Of United States Marine Corps Acronyms And Expressions