The Pacific Theather isn't as covered by popular video game companies. Only a few like Medal of Honor: Pacfic Assault and Rising Sun. There are weapons that are uncommon if not extinct to the European Theather.

M1941 Johnson Rifle

M1941 Johnson Light Machine Gun

M50 Reising SMG

M55 Reising SMG (M50 w/folding stock)

M1928A1 Thompson SMG (Navy Issue Thompson, Army used the M1 and M1A1 seen in the European Theather)

M1917 Smith & Wesson or Colt Revolver

M2 Flamethrower