The Pentagon flight tested an unarmed warhead for the Sentinel ICBM

The Pentagon flight tested an unarmed warhead for the Sentinel ICBM

The U.S. Air Force conducted a flight test of the new Mk21A warhead, which will be installed in nuclear equipment on the LGM-35 Sentinel intercontinental ballistic missile under development, according to the U.S. Air Force Nuclear Weapons Center.