ELKTON, Md.--Northrop Grumman's [NOC] propulsion systems and control (PS&C) business expects to build 440 solid rocket motors (SRMs) here annually by 2027--up from the current 90--as part of a $100 million company investment at the Elkton site to boost production of SRMs and hypersonic air-breathing engines. Such motors may include PS&C's largest program for the U.S. Air Force--the Hypersonic Attack Cruise Missile (HACM). On that effort, Northrop Grumman is teaming with RTX's [RTX] Raytheon to build HACM's scramjet engine. Northrop…
