Lockheed completes GMLRS Alternative Warhead operational flight tests Lockheed Martin "successfully" completed all Developmental Test/Operational Test flight tests for the new Guided Multiple Launch Rocket System Alternative Warhead at White Sands Missile Range, New Mexico. The DT/OT tests included rockets fired at both mid and long range. All rockets were fired from a High Mobility Artillery Rocket System launcher. The DT/OT tests were the first tactically representative flight tests against simulated targets, and were also the first tests conducted with soldiers operating the fire control system. These missions were preparation for the Initial Operational Test and Evaluation exercise, which will be conducted in the fall.