A military base is a rabbit hole building found in The Sims 3.
Sims can go to a military base to get a job in the Military career, attend a Handiness class, or tour the base. It is possible to WooHoo on a military base, but not until after touring the base. If Seasons is installed, aliens can go sell extraterrestrial secrets to the military base between 6 AM and 8 PM, and the alien will be rewarded with some simoleons.
There is no military base in Bridgeport, Appaloosa Plains, Starlight Shores, Moonlight Falls, and Isla Paradiso. Sims who live in these worlds and are in the military career work in the City Hall, as it contains the Military Headquarters. You can add one via Edit Town, however most NPC's will still go to City Hall.
- The Grunt Military Base and Mango's Military Base are probably named after the Grunt and Mango families, respectively. This is considering both families are mainly involved in Military.
- At 5 AM, "Reveille" plays on the military base, however, it won't happen if the military base is inside the city hall.