1962 United States Tri-Service aircraft designation system
The Tri-Service aircraft designation system is a unified system introduced in 1962 by the United States Department of Defense for designating all U.S. military aircraft. Previously, the U.S. armed services used separate nomenclature systems.
Before the introduction of the tri-service designation system, the F-4 Phantom II was designated F4H by the U.S. Navy, and F-110 Spectre by the U.S. Air Force.
The Lockheed HC-130 is an extended-range, search and rescue (SAR)/combat search and rescue (CSAR) version of the C-130 Hercules military transport aircraft, with two different versions operated by two separate services in the U.S. armed forces.
Lockheed HC-130
A USAF HC-130P refuels an HH-3E Jolly Green Giant, 1968.
USCG HC-130H on International Ice Patrol duties
USCG HC-130H departs Mojave