Last time he knew it was ww2, he was resting in the trenches before stupidly agreeing to seeing his 'other self' to some girl he met, he thought she was joking untill he woke up to her leading him and his sargent George into some house.

the house was somewhere in America, it looked like a run down town. As they stepped inside they saw a man drunk on the couch and something drop upstairs, the girl lead them up there.