Our PES Services include expertise in modeling and simulation, network engineering, communications, control systems, weapons systems, defense operations, logistics, test and evaluation, aerospace, transportation, medicine, and health, energy and environmental systems, robotics, intelligence, security, sensors and instrumentation, signal processing, critical infrastructure protection, mission planning, systems acquisition, systems analysis, and systems integration. Service offerings are organized into six Special Item Number (SIN) functional arpes. The following engineering disciplines are covered under each SIN.