This is a sources sought notice for engineering services to assess the E-6B aircraft's structure and subsystems and develop maintenance plans to extend its service life. The anticipated period of performance is nine years, starting in the second quarter of Fiscal Year 2027. The work is to be performed at the contractor's facility and Tinker Air Force Base in Oklahoma City, Oklahoma. The primary requirements are to conduct a Subsystems Service Life Assessment Program (SSLAP) and a Structural Integrity Assessment. Interested parties must submit a capability statement, including their proposed approach and a Rough Order of Magnitude price, to the listed government points of contact.