How they were dressed in 1940

The song I'm thinking of goes more like;

"Johnny get your,get your gun, get your gun."
"Put the Hun on the run, on the run, on the run."

Now wait till I put my tin hat on, my head is allergic to flying frying pans.

I believe it is from a show called "Yippity Yappity" or something like that.

As a movie I believe it was called "This is the Army" with George Murphy, Ronald Regan, Kate Smith, Irving Berlin and others.

Of course I could be all wet.