Sergeant Carter puts Gomer on guard duty and orders him not to let anyone enter the base without identification, no exceptions. Then Gomer refuses the sergeant entry when Carter comes back for his forgotten wallet.
Duke draws on Gomers arm. Lou-Ann thinks it's a real tattoo; she hates it but doesn't tell Gomer thinking it's too late. Gomer hates it but goes to make it permanent thinking Lou-Ann likes it. She finds out just in time to stop him.
Sergeant Carter saves Gomer from a live grenade that Gomer dropped during exercises and Gomer becomes a pest repaying the sergeant for the deed so Carter sets it up for Gomer to save his life. This is an obvious Mayberry rewrite.
Gomer and Lou-Ann find a diner closed without customers and try to help them build business but the only thing the restaurant owners are interested in is robbing the bank next door through the basement wall.
The Marines send Carter's and Hacker's platoons to maneuvers. Hacker tricks Gomer into giving the location of Carter's tents, so they have to move in the middle of the night. Carter accidentally raids a girl scout camp, due to faulty information from Pyle. Carter sends Pyle back to the base. Pyle is captured by Hacker, and then escapes. Pyle visits the girl scouts, Hacker's platoon raids. Carter platoon right behind them, capturing Hacker platoon. Hacker back at the base, pays the $50 lost the bet. A surprise twist at the end leaves Gomer smiling, and both Sargeants ...
Gomer heads home to buy a gas station with his cousin Goober; Sergeant Carter goes with him. Gomer and the Sergeant run into pickpockets. In the end Gomer decides he's better off in the marines with the Sergeant to look after him.
Gomer finds a white rabbit, gives it to a General's son and the Sergeant lets it loose thinking Gomer is keeping an unauthorized bunny. The rabbit must be found and the search is on but there are many white rabbits on base.
Sergeant Carter's sister arrives and the Sergeant is embarrassed by her looks so he gets her a make-over that just isn't her. Gomer talks her into going back to her old self and he takes her to a dance.
As the series ends Gomer requests a transfer to get out of Sergeant Carter's hair and the Sergeant kills the transfer. This series had great characters but poor writing often repeating the same plots in multiple shows season to season.