Engineering services, namely, research, design, development, systems engineering and analysis, testing and integration of hardware and software in the fields of missile defense, space and aviation; Systems engineering; computer systems simulation and analysis, namely, modeling of unmanned aerial vehicles; Scientific research services rendered to government and private industry in the fields of national security technology, national defense, design and integration, test and evaluation, logistics, defense communications, industrial and business services, space transportation and exploration, space systems analysis, security systems and support, information and communications; Scientific technological design services rendered to government and private industry in the fields of national security technology, national defense, design and integration, test and evaluation, logistics, defense communications, industrial and business services, space transportation and exploration, space systems analysis, security systems and support, information and communications