The cover for the NES version has the blood color on the NARC logo changed to yellow
On September 28, 1991, NARC was put on the infamous German index by the BPjS. For more information about what this means and to see a list of games sharing the same fate, take a look here: BPjS/BPjM indexed games.
Surprisingly, this game was released practically uncensored for the NES, except for one thing: the dogs. Of the things Nintendo could have done, they had Acclaim change it so that when you shot the dogs, they turned into puppies. The other versions of the game allowed you to kill the dogs.
Ironically, in the game's manual, a tip for getting rid of landmines stated: "Avoid 'em. Or coax a pitbull to run over 'em."