>imperialistically occupy foreign countries.
Most bases are made with contracts by the hosting nation except those in a war state. There maybe some that could be closed but the vast majority is designed to save US lives in times of trouble for the reasons I mentioned. Could you be deployed right now to a desert, a jungle, a country side, in a hostile environment with people shooting at you and just function off the land and wait for supplies? It would be better to be deployed to a base with running water, gas, electric, toilets, showers, medical facilities, counselors, have armament supplies, and a fortified roof over your head. Most are needed safeguards.