Even as a kid I always heard, in my mind, "F... 'Em All" whenever some movie GIs sang "Bless 'Em All".

Finally figured out that as a toddler during the Occupation of Japan I must have heard Aussies or Kiwis singing the "correct version" in some smoke filled bar or night club. Strangely - one of my earliest memories is being in just such a setting with my parents and their friends.