The Military Base is an unnamed U.S. military base situated not that far from Dimmsdale.
After Cosmo accidentally activated the bomb Poof found thinking it was an alarm-clock, Sergeant Flinch told General McCloud about it, and first McCloud didn't care as the island wasn't populated. So Crocker and the class who were on a tour were given seats and juice to see the bomb explode. But when Flinch saw the island was inhabited by the Turners and Elf, the General tried to deactivate the bomb as he didn't want to be on Santa's naughty list. Unfortunately, Crocker spilled grape juice in the controls to prevent it from happening. Luckily, the Turners, the Elf and Dad's wooden friends escaped on the Turner car, which Dad turned into a submarine in his spare time.