It is possible for an abbreviation to have multiple reverences. A new one can evolve while there is allready another abbreviation for another expression, without the persons starting the new one being aware of the older one.
So I think it is very likely that G.I. came from General Infantry (what I allways thought it meant), even though an older abbreviatons existed.
So I think it is very likely that G.I. came from General Infantry (what I allways thought it meant), even though an older abbreviatons existed.