zipperhead

Etymology 1
. From the leather helmets formerly used by early Canadian armoured crewmen, with a pattern of stitching resembling a zipper. There is also a folk etymology referring to the zippers on armoured-vehicle crew suits (repurposed flight suits).

Noun

 * 1)  A soldier in the Royal Canadian Armoured Corps or in the Armoured Crewman military trade.

Synonyms

 * trooper
 * crewman, tanker, armoured crewman, armoured soldier
 * tread-head, treadhead

Etymology 2
1960s–1970s,. Used by soldiers during the Korean and Vietnam Wars; multiple hypotheses exist as to the specific origin. One is that if an East Asian person were shot in the middle of the forehead with a machine gun, the head would split as if being unzipped; another, that the appearance of tire tracks on a body having been run over by a military Jeep or that of tank tracks resembled a zipper.

Noun

 * 1)  A person of East Asian descent.

Synonyms

 * zipperlid
 * gook
 * slopehead
 * slant eye
 * almond eye's