[military] G.I. is a noun used to describe the soldiers of the U.S. Army and airmen of the U.S. Army Air Forces — and occasionally for U.S. Marines and shorebound sailors — and also for general items of their equipment. The term G.I. has been used for a long time as an initialism of `Government Issue` or `General Issue`, but it original...
Found on
http://en.wikipedia.org/wiki/G.I._(military)

Government Issue, a marking stamped on U.S. equipment. Nowadays used to mean U.S. Infantryman.
Found on
http://www.encyclo.co.uk/local/20524
GI verb clean in preparation for inspection; `the soldiers GIed the barracks`
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.