This typewritten reference card lists UHF radio channels and frequencies used by an F-4 Phantom fighter squadron operating under the call sign "Gunfighter," dated 15 July 1971. Aircrews carried cards like this to quickly tune tower, ground control approach, departure, and tanker frequencies during combat and training sorties flown from bases such as Danang Air Base, South Vietnam. Though modest in appearance, such documents were essential tools of Vietnam-era air operations, standardizing communication between fighter pilots, controllers, and support aircraft in a busy and often contested airspace. Project: 218454