Metcoware metal cup. says u.s. 1940 on bottom?

Question

bought at garage sale, does anyone know any history?

Answer 1

It sounds like it might be a canteen cup, does it have a handle that folds underneath it?  Aluminum? If so i'm sure that's what you have.  If it is a canteen cup, soldiers may have cooked in it, or obviously drank from it.  

Who knows where that cup may have been in it's lifetime, France, Germany, Japan???  Or more importantly where has the original owner been with it??