The 'word': G.I.
As in G.I. Joe, or some other comando.
It is a military term that is short for Government Issue. The term was used to refer to any piece of equipment used by U.S. servicemen. Apparently, in World War II, the term G.I. was half-jokingly applied to the soliders themselves, as if they were manufactured by the government- they were G.I.!