Space Force Col. Richard Bourquin, Space Delta 4 commander, and Lt. Col. Ryan Durand, 10th Space Warning Squadron commander, begin the safety brief of the Perimeter Acquisition Radar Attack Characterization System building at Cavalier Air Force Station, , Feb. 22, 2021. During their visit to Cavalier AFS, DEL 4 leadership received a tour of the geographically-separated unit's unique missile warning operation, the 10th SWS Mission Defense Team, and more.

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