unit, remained at Groom Lake until the last production F-117 was delivered from Lockheed in July 1990. During the operational lifetime of the F-117 however, personnel from Tonopah and later Holloman AFB would be temporarily deployed to Groom Lake for various checkout flights of classified elements of the aircraft. The F-117 project was highly classified and Tonopah Test Range became a black project facility. Nearly all Air Force personnel and their families lived in the city of Las Vegas. Group personnel would be flown to Tonopah each Monday morning and board a contract Key Airlines Boeing 727-100 aircraft at Nellis AFB, which operated about 15 daily flights between the two bases. The member would live in dormitories at "Mancamp" during the work week, then fly back to Nellis AFB Thursday afternoon or Friday morning. All dormitory rooms had private bathrooms and showers, televisions with about 30 cable TV channels, a telephone with unrestricted local service to Las Vegas, access to laundry rooms in the building, and access to 24-hour recreational and dining facilities around Mancamp. Civilian engineers and executives were allowed to commute on the Key Airlines or Janet flights, but all other civilians generally lived in the surrounding region and drove to the TTR in their own vehicles or commuted in chartered buses. On Friday afternoons, the reverse would take place, leaving only essential personnel at Tonopah over the weekend. At Nellis, the passenger jets sitting in the shadow of the foothills bordering the flight line became a common sight. If the base personnel knew—and many of them did—that the contractor aircraft were there to ferry most of the 2,500 inhabitants of Tonopah to work, they did not talk about it much. It was part of what became known as the “Night Hawk spirit,” the devotion to a secret worth keeping. It pervaded Tonopah and its sister base at Nellis, where thousands of family members knew not to ask where their loved ones went for four days each week. Support aircraft Because of the tight restrictions on F-117A flights during the 4450th TG "black" era, a surrogate aircraft was needed for training and practice and to provide a cover story for the 4450th TG's existence. The aircraft chosen was the Ling-Temco-Vought (LTV) A-7 Corsair II. The A-7Ds came from England AFB, Louisiana, which was converting to the A-10 Thunderbolt II. The A-7 had been chosen as an interim trainer