An airman, who barricaded himself with a handgun in a building at Schriever Air Force Base, Colorado, surrendered to the authorities Monday night.
Officials said no shots had been fired during the standoff.
The man surrendered at 8 p.m. and he was detained by law-enforcement officials, said Schriever Air Force spokeswoman Jennifer Thibault. His name and rank weren't released. He was reportedly taken to Teller County where he would be on suicide watch.
The airman was in a building where personnel prepare for deployments and it was evacuated after the standoff had begun, the Associated Press reported.
The Air Force base, situated about 60 miles south of Denver, controls GPS satellites. Control rooms for GPS and other military satellites are in a separate, heavily protected inner compound.
Officials were investigating how the man managed to take handgun to the air base past security.