Malmstrom Air Force Base

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In this image provided by the U.S. Air Force, Airman 1st Class Jackson Ligon, 341st Missile Maintenance Squadron technician, prepares a spacer on an intercontinental ballistic missile during a Simulated Electronic Launch-Minuteman test Sept. 22, 2020, at a launch facility near Malmstrom Air Force Base in Great Falls, Mont. The U.S. says it is tracking a suspected Chinese surveillance balloon that has been spotted over U.S. airspace for a couple days but the Pentagon decided not to shoot it down due to risks of harm for people on the ground. One of the places the balloon was spotted was Montana, which is home to one of the nation's three nuclear missile silo fields at Malmstrom Air Force Base (Tristan Day/U.S. Air Force via AP)