From the Usual USAF Source:
C-130 Deliveries Hit 2,400: Lockheed Martin announced the delivery of the 2400th C-130 Hercules that it has manufactured on its production line in Marietta, Ga. The company said Marietta's Hercules assembly activities represent "the longest continuously operating military aircraft production line in history." The 2,400th C-130 is an Air Force MC-130J special-mission aircraft destined for beddown at Cannon AFB, N.M. This aircraft's delivery follows a record year for C-130J production in 2011, with 33 C-130Js supplied, a new high for the C-130J model, according to the company. These 33 C-130Js were in six different configurations for six operators: Air Mobility Command, Air Force Special Operations Command, the Marine Corps, Canada, India, and Qatar. According to the Air Force, the company delivered the first C-130s in December 1956. (Image from Wikipedia. "C-130s from the: US, Canada, Australia and Israel [foreground to background]")
Further... from The Wiki:
Over 40 models and variants of the Hercules serve with more than 60 nations.
During its years of service, the Hercules family has participated in countless military, civilian and humanitarian aid operations. The family has the longest continuous production run of any military aircraft in history. In 2007, the C-130 became the fifth aircraft—after the English Electric Canberra, Boeing B-52 Stratofortress, Tupolev Tu-95, and Boeing KC-135 Stratotanker—to mark 50 years of continuous use with its original primary customer, in this case, the United States Air Force. The C-130 is also the only military aircraft to remain in continuous production for 50 years with its original customer, as the updated C-130J Super Hercules.
I think that's amazing, considering the way technology has changed every facet of life since 1956. Like the BUFF and the KC-135, a few of the Herky Birds are older than many of the pilots that fly them. Unlike the BUFF and the -135, there are many NEW -130s on the ramps of Air Force bases. That's amazing too, but not in a good way.