“Radar, optical and telemetry sensors on the atoll support missile testing, missile launches, space reconnaissance and surveillance operations, and science experiments for the Department of Defense and multiple other government agencies,” the Army says in a profile of the test site.

It is also a key site for monitoring foreign space and missile activity, the profile says.

“With first visibility of most launches out of Euro-Asia, RTS provides critical orbital information on new foreign launches in support of the U.S. Strategic Command.”

About 1,300 Americans live and work on Kwajalein Atoll in total, according to the Army.