What's up, guys? I discovered this trick to change your player skins in-game during a singleplayer campaign. Get your console up and type in g_playermodel "skin name", where the skin name is whatever skin you want. Now, you guys can be Hitler charging the beach at Omaha, or you can empty a 50-round clip into a machine gunner's back as Porky Pig while you yell "That's all folks!"
For me, I prefer my American Ranger skin I made:
What's up, guys? I discovered this trick to change your player skins in-game during a singleplayer campaign. Get your console up and type in g_playermodel "skin name", where the skin name is whatever skin you want. Now, you guys can be Hitler charging the beach at Omaha, or you can empty a 50-round clip into a machine gunner's back as Porky Pig while you yell "That's all folks!"
For me, I prefer my American Ranger skin I made:
Cheers didn't know about that one cool 
been a while since I had a good play on Single player campaign so kind of thinking will be cool to play it from the start :)
Oops, I forgot to add - you may need to enter the console code at the start of a new mission. You can check using your 3rd person toggle to see whether he's dressed appropriately or not.