When returning from a hike, Gomer is talking to another Marine. From the front, Gomer is holding his rifle in front of him, from the rear view his rifle is slung over his right shoulder.
The bet between Hacker and Carter was for Carter to go 24 hours without blowing his stack. About half way through the show Carter is seen driving his jeep way out into the countryside and running up a hill and thoroughly blowing his top after the dead chicken incident during inspection. At this point he has technically lost the bet with Hacker but with no witnesses, he gets away with it.