Currently USA only has one base left: Pituffik Space Base (previously called Thule Air Base). They used to have about 17 bases and several thousand military personnel, but now it's down to about 200.
If USA wanted it, they could establish all the bases they wanted and send more people, but they chose to cut down on military presence over the past years.
Source: Have worked on that last base several years ago.
Also check wikipedia: https://en.wikipedia.org/wiki/Pituffik_Space_Base
actionfromafar|1 month ago