| W |
| WAAPM | Wide Area Antipersonnel Mine |
| WAC | Womans Army Corps |
| WAFC | Women's Armed Forces Corps |
| WAMTMTS | Western Area Military Transport Management Terminal Service |
| WBGP | Waterborne Guard Post |
| WBLC | Water Borne Logistics Craft |
| WESTPAC | Western Pacific (CINCPAC area of responsibility west of 1600E) |
| WHEC | US Coast Guard High Endurance Cutter |
| WIA | Wounded in Action |
| WILD WEASEL | F-105F specially equipped for locating and attackng SA-2 sites (employed on IRON HAND missions). |
| WIP | Work-in-Place |
| WLV | Coast Guard Light Ship |
| WP | White Phosphorus |
| WPAFB | Wright-Patterson Air Force Base |
| WPB | US Coast Guard Patrol Craft |
| WPC | World Peace Council |
| Wpn/WPN | Weapon |
| WPNS | Weapons |
| WRAIR | Walter Reed Army Institute of Research, Vietnam |
| WRALC | Warner-Robins Air Logistics Center |
| WRAMA | Warner-Robins Air Material Area |
| WRFC | Women's Armed Forces Corps |
| WRM | War Reserve Material |
| WWMCCS | Worldwide Military Command and Control System for US Forces |
| WZ | War Zone |