Can any emulator run Senjou no Ookami (Japan) without graphical glitches? Nestopia and FCEUX experience the same issue.
戦場の狼 is a discrete logic board (UN1ROM), a very subtle variant of ordinary UNROM. If you see glitches in it, and don't see them in Commando, I would naïvely assume it's a bug in the original version ...