This is a presolicitation for the repair of two Turret Sensor-Sight units in support of Saudi MH-60R helicopters, which is a Foreign Military Sales requirement. The work is sole-source to Raytheon in McKinney, TX, as the only known approved source, but the agency will consider capability statements from other responsible sources. Any company that is not already a government-approved source must submit a detailed source approval request with its proposal, as these are flight-critical items. The approval process for a new source is typically too lengthy to delay an award. The notice emphasizes that proposals lacking the required source approval documentation will not be considered.