List down some points about military base from the given passage. 
 1. A military base is a structure that is directly owned and run by or for the military or one of its branches, houses military people and equipment, and aids in operations and training.
2. A military base may serve as a command post, a training area, or a proving ground in addition to housing one or more units.
3. Military bases typically rely on outside assistance to function.
4. However, some sophisticated bases can survive on their own for extended periods of time because they can supply their residents with food, water, and other essentials even when they are under attack.
5. Military air bases, or simply "air bases," are bases for military aviation.
6. Naval bases are bases for military ships.