Engility Holdings, Inc. (Engility) is a provider of systems engineering services, training, program management, and operational support for the United States Government worldwide. The Company's business is focused on providing a range of engineering, technical, analytical, advisory, training, logistics and support services. The Company operates in two segments: Professional Support Services and Mission Support Services. The Professional Support Services segment provides Systems Engineering and Technical Assistance (SETA) services, program management support and software engineering lifecycle sustainment and support services. Through its Mission Support Services segment, it provides capabilities, such as defense related training, education and support services, law enforcement training, national security infrastructure and institutional development. In July 2012, L-3 Communications Holdings, Inc. (L-3) completed the spin-off of Engility.