That leads to the 1917 song "Over There"
https://en.wikipedia.org/wiki/Over_ThereThe verse starts:
Johnny, get your gun, get your gun, get your gun.
Take it on the run, on the run, on the run.
Hear them calling you and me,
Every Son of Liberty.
Hurry right away, no delay, go today.
Make your daddy glad to have had such a lad.
Tell your sweetheart not to pine,
To be proud her boy's in line.