Topical Terminology > YD
YD
For YD we have a term and definition in Vietnam War.
YD (Vietnam War) 
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.
Zippo (or Zippo track). Term used for flame throwers (or flame thrower mounted on M113 chassis).
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