Produced by Lockheed during more than 50 years.
STOL and high payload capabilities are the main advantages of this airplane used by many air forces. A lot of variants are produced for military and civil usages.
Mainly used in Vietnam in transport, gunship, and special operations roles.
There is a few C-130 available for FSX.
Captain Sim C-130X-perience pack provide high quality models.
You can find it at Captain Sim
Also freeware models are available, search for Premier Aircraft Design and Mike Stone 's C-130
Lockheed P-3 Orion
Produced by Lockheed from the Electra model.
The Orion is a long-range maritime patrol aircraft.
Used during Vietnam war to patrol along the coast (Operation Market Time).
A great model, FSX and freeware, is available from KBT Team, Daisuke Yamamoto and Hiroaki Kubota , available at Flightsim.com
Grumman A-6 Intruder
Produced and designed by Grumman as a replacement for the A-1 Skyraider, in carrier-based attack aircraft role.
Intruder remain in service from 1963 until 1997.
Used in Vietnam by US Marine Corp and Navy, from carriers and land-based.
Produced by McDonnell Douglas, introduced in service in 1960, and still in service in many countries.
Phantom II is one of the best jet fighter never made, used in many roles, by USAF, USMC and USN.