Ability to obtain INTERIM U.S. government issued security clearance is required prior to start date At RTX, the world’s largest aerospace and defense company, 185,000 great minds are united by purpose and inspired to make a difference solving the world’s most complex problems. The MDS department delivers cutting-edge expertise in concept development, architectural design, requirements generation and flow-down, modeling and simulation, systems analysis, integration, test, and evaluation of world-class Missile Defense & Sensor Systems.