Back on 22 July 2008, allan s. wrote, "Has anyone heard of a yiddish song with the words Yossel Bear????
I remember it back in the 1950's played on station WELI in the New Haven , CT area   by a man who went by the name Berril Howard. his actual name was Bernard Horowitz
the choris went [Yossel Yossel Bear, gayt in die Militair]
"Yossel bear goes in the Military"
I suspect the reference could have refered to WW-2"

Look for Dan Kahn (or Daniel Kahn) and Yosl Ber (or Yossel Ber) and you will find links to Youtube videos, lyrics, and a CD by Kahn and the Painted Bird.