XIN LOI or XOINE LOI: Pronounced by GIs as "Sin Loy," meaning 'too bad,' 'tough shit,' 'sorry bout that.' The literal translation is "excuse me."
XM-203: Fired the 40mm shells, fit on the M-16.
XO: Executive officer; the second in command of a military unit.
X-RAY: Military phonetic for the letter 'X'.
YANKEE: Military phonetic for the letter 'Y'.
YARDS: Montagnard soldiers.
YD: The grid 100,000 meters by 100,000 meters square from the Universal Transmercator (UTM) Grid Zone 48Q. The UTM map of the world dispenses with latitude and longitude in favor of a system of metric coordinates (usually six digits) which enable the user of the map to specify a location within 100 meters.
ZAPPED: Killed.
ZIP: Derogatory term for Vietnamese people.
ZIPPERHEAD: Derogatory term used to describe Vietnamese.
ZIPPO: Flamethrower. Also refers to the popular cigarette lighter of that brand name.
ZIPPO BOATS: LCMs with flame throwers.
ZIPPO MISSION: Search and destroy mission.
ZIPPO RAIDS: Military operations which involved burning down Vietnamese villages. Often Zippo cigarette lighters were used to ignite the huts.
ZIT: Derogatory term for Vietnamese people
ZONE AND SWEEP: Artillery tactic/fire pattern to cover a target with an "X" pattern of fire.
ZULU: Casualty report.
ZULU: Military phonetic for the letter 'Z'.
