The US Air Force and Lockheed Martin performed a flight test of the Mk21A reentry vehicle in the Pacific Ocean on June 17. The Mk21A is planned to ride atop the Sentinel intercontinental ballistic ...

The United States carried out a training launch of a Minotaur I rocket with the Mk21A warhead not equipped with nuclear charge from the Vanderberg US Space Force base. "An operational test launch ...