Aerojet Rocketdyne [AJRD] said on July 21 that it has finished a second series of propulsion system tests under the Defense Advanced Research Projects Agency's (DARPA) Operational Fires (OpFires) program to develop a ground-launched hypersonic missile for tactical use. "During the propulsion tests, called cold gas testing, the test articles operated successfully with all components providing critical data to the operation of the OpFires propulsion system," Aeroject Rocketdyne said in a statement. "The test series followed last year’s successful subscale…
