The document discusses platform stewardship from the perspective of the Heavy Air Lift SPO. It outlines how the concept of platform stewardship evolved from traditional contract management and weapon system integration. Platform stewardship is defined as optimizing the sustainment of a platform on an enduring basis to achieve operational requirements. This involves a shared responsibility between industry and the Commonwealth, with industry taking on more of a management and advisory role and the Commonwealth retaining ultimate decision-making authority and assurance responsibilities. The document also discusses challenges for both TLS contractors taking on platform stewardship roles and for the Commonwealth in establishing this new framework.