I grew up in the 50's/60's [born 1949] and never heard of Sarge Steel or Charlton Comics...Sgt Rock & Easy Co were the only WW II comics I can recall...They weren't the only combat comic stories; there were AAC and Navy tales too, but Rock & the members of his company were the only recurring stories/characters...
I do recall a story from DC's combat-action comics called "Ghost Ship Of Three Wars" where some WW I biplane flew into a cloud and entered WW II Europe against BF-109's, then into another cloud and flew into Korea against Mig 15's...IIRC, the enemy planes all had the same nose-art (like it was the same pilot each time)...I really can't recall any other storylines from the combat comics...Somebody told me they 'cleaned up' Sgt Rock in the later comics; no cigar, no #$%^*@ symbols, no ethnic labels...I guess Rock wasn't politically correct enough...
Funny what things you can remember from 50+ years ago...