Lockheed Martin has received a $536m contract modification from the US Air Force for sustainment of the F-22 Raptor. The funding is part of a Performance-Based Logistics (PBL) contract providing weapon systems sustainment of the F-22 fleet at all operational bases for the 2017 calendar year. As the OEM and SI for the F-22 Raptor, LM works closely with the USAF to integrate a total life-cycle systems management process to ensure that the Raptor fleet is ready to perform its mission.