Question: The Fairchild C-123 Provider has performed service for what type of force?

Context paragraphs:
Pingat Jasa Gemilang: The Pingat Jasa Gemilang ("Meritorious Service Medal") is a medal instituted in Singapore in 1962.  It may be awarded to any person who has performed service of conspicuous merit characterised by resource and devotion to duty, including long service marked by exceptional ability, merit and exemplary conduct within Singapore.  In exceptional circumstances, the Medal may be awarded to any person who has performed, outside Singapore, service of conspicuous merit characterised by resource and devotion of duty, including service marked by exceptional ability, merit and exemplary conduct.

Fairchild C-123 Provider: The Fairchild C-123 Provider is an American military transport aircraft designed by Chase Aircraft and subsequently built by Fairchild Aircraft for the United States Air Force.  In addition to its USAF service, which included later service with the Air Force Reserve and Air National Guard, it also went on to serve most notably with the United States Coast Guard and various air forces in South East Asia.  During the Vietnam War, the aircraft was used to spray Agent Orange.

606th Special Operations Squadron: The 606th Special Operations Squadron is an inactive unit of the United States Air Force.  The squadron was first activated as the 606th Air Commando Squadron in March 1966 and stationed at Nakhon Phanom Royal Thai Air Force Base, Thailand.  The squadron flew C-123 Provider aircraft over the Ho Chi Minh trail at night during the Vietnam War to interdict the movement of people and equipment.  The squadron was inactivated on 30 June 1971.

464th Troop Carrier Group: The 464th Troop Carrier Group was a theater airlift unit of the United States Air Force during the Cold War.  It served in the United States under Tactical Air Command between 1953 and 1957.  The group operated Fairchild C-119 Flying Boxcar and Fairchild C-123 Provider aircraft as the flying element of the 464th Troop Carrier Wing until being inactivated when the wing was reorganized.

Air National Guard: The Air National Guard (ANG), also known as the Air Guard, is a federal military reserve force as well as the militia air force of each U.S. state, the District of Columbia, the Commonwealth of Puerto Rico, and the territories of Guam and the U.S. Virgin Islands.  It, along with each state's, district's, commonwealth's or territory's Army National Guard component, makes up the National Guard of each state and the districts, commonwealths and territories as applicable.

Stroukoff YC-134: The Stroukoff YC-134, designed in 1956, was based heavily on the Fairchild C-123 Provider.  The United States military contracted with Stroukoff Aircraft Corporation to develop an improved version of the aircraft, combining features that the company had developed for the YC-123D and YC-123E.

Chase XCG-20: The Chase XCG-20, also known as the XG-20 and by the company designation MS-8 Avitruc, was a large assault glider developed immediately after World War II by the Chase Aircraft Company for the United States Air Force, and was the largest glider ever built in the United States.  The XG-20 did not see production due to a change in USAF requirements, however, it was modified into the successful Fairchild C-123 Provider twin-engined transport aircraft which saw extensive service in the Vietnam War.

Pingat Penghargaan (Tentera): The Pingat Penghargaan (Tentera) ("Commendation Medal (Military)") is awarded to any member of the Singapore Armed Forces who has placed himself above his peers through commendable achievements in military command or staff work, or who has performed service over and above the call of duty.

Corporate Air Services HPF821: Corporate Air Services HPF821 was a transport aircraft delivering weapons via airdrop to the Nicaraguan Contras which was shot down over Nicaragua on 5 October 1986 by a surface-to-air missile.  Two U.S. pilots and a Nicaraguan radio operator died when the Fairchild C-123 Provider was shot down by a Sandinista soldier using an SA-7 shoulder-launched missile, while Eugene Hasenfus, the U.S. "kicker" responsible for pushing the cargo out of the aircraft, survived by parachuting to safety.  The aircraft was carrying "60 collapsible AK-47 rifles, 50,000 AK-47 rifle cartridges, several dozen RPG-7 grenade launchers and 150 pairs of jungle boots".

Stroukoff Aircraft: Stroukoff Aircraft was an American manufacturer of experimental military transport aircraft, established in 1954 by Michael Stroukoff.  Successor to Chase Aircraft, the company specialised in developing advanced variants of the C-123 Provider; however, none of the company's designs attracted a production order, and the company folded in 1959.

Supporting paragraphs: Fairchild C-123 Provider Air National Guard
Answer: federal military reserve