The Department of Defense, through the Naval Air Systems Command, intends to award a sole-source contract to Raytheon Technologies Corporation, Pratt and Whitney Military Engines, for F135 Flight Test Support related to the F-35 Lightning II program. This contract will encompass a range of services including flight test support, propulsion system program management, spare parts procurement, and technical engineering support for the F-35 Block 4 upgrades. The F135 propulsion system is critical for the operational capability of the F-35 aircraft, and the contract is expected to be awarded in the first quarter of fiscal year 2027. Interested parties may submit capability statements to Luis F. Pola at luis.pola@jsf.mil, although the government reserves the right to proceed with the sole-source procurement without a formal solicitation.