Activated in 1940 as a Southwest Air District pursuit squadron, equipped with a variety of 1930s-era pursuit aircraft. Re-equipped with P-38 Lightning fighters and deployed to Alaska, engaged in combat during the Aleutian Campaign, 1942–1943.[4] Remained in Alaska as part of the air defense forces until inactivated in August 1946.
Reassigned to Grand Forks AFB, North Dakota in 1960 and received the new McDonnell F-101B Voodoo supersonic interceptor, and the F-101F operational and conversion trainer. The two-seat trainer version was equipped with dual controls, but carried the same armament as the F-101B and were fully combat-capable. Inactivated in April 1971 as part of the drawdown of ADC interceptor bases, the aircraft being passed along to the Air National Guard.
In 1991, the squadron converted to the Lockheed Martin F-16 Fighting Falcon. In 1997, elements of the 18th FS deployed to Singapore and Malaysia to take part in dissimilar air combat tactic training as part of Exercises Commando Sling and Cope Taufan, respectively. The Cope Taufan deployment marked the first time Pacific Air Forces' F-16s had flown against MiG-29s. The unit deployed to Ahmad al-Jaber Air Base, Kuwait, October–December 1998 to support Operation Southern Watch. Later, the squadron deployed to Incirlik Air Base, Turkey, September–December 2000, in support of Operation Northern Watch. For this deployment, the squadron employed 5 F-16 aircraft and 110 personnel, conducting the first ever Combat Search and Rescue support tasking for an F-16 squadron. After the 11 September 2001 attacks, the 18th FS was called to provide eight aircraft for Alaska NORAD air defense during Operation NOBLE EAGLE, though the aircraft were not launched.
The squadron's next deployment was to Ahmed Al Jaber Air Base from December 2001 to March 2002 to support simultaneous combat operations for Operations Southern Watch and Operation Enduring Freedom. They flew more than 3,200 hours in only 3 months, an amazing feat for the 142 Blue Foxes who deployed with only 10 aircraft. During that time, the 18th FS flew missions in support of Operation Anaconda, including one in the Shah-i-Kot Valley on 2 March when U.S. forces, engaged in a firefight with Taliban and Al Qaeda forces, called for aerial assistance. A number of Blue Foxes responded, dropping bombs with pinpoint accuracy on the opposing forces. Lt. Col. Burt Bartley, the 18 FS commander at the time, received the Silver Star for strafing and dropping 500 lbs Laser-guided bombs on what would later be known as "The Battle for Roberts Ridge".
The squadron deployed to Andersen Air Force Base, Guam in support of Operation Noble Eagle during March 2003. The unit also participated in Exercise Commando Sling in October 2003.
As part of the change from COPE THUNDER to Red Flag-Alaska, the 18th FS was re-designated the 18th Aggressor Squadron. The squadron trains in the same manner as the aggressors at Nellis Air Force Base, learning the flying styles and abilities of foreign air forces in order to train USAF pilots against realistic opposition. Aircraft changes entail sending all 18 of its Block 40 F-16 Fighting FalconstoKunsan Air Base, Korea, and receiving 18 Block 30 F-16s from Kunsan.
In 2013, the Air Force, responding to the Department of Defense strategy guidance of December 2012, proposed consolidating all fighter units in Alaska at Joint Base Elmendorf-Richardson. This would involve the move of the 18th from Eielson Air Force Base to Elmendorf.[5] While the move was pending, in response to the sequestration of defense funds, the squadron's aircraft were grounded in the middle of April for a period of three months.[6] The squadron move was strongly opposed by civic leaders from both Fairbanks and Anchorage, Alaska. The civic leaders were joined by the Alaska congressional delegation, who wrote language barring the use of funds in the Defense Appropriations Bill to move the squadron, and delayed the promotion of a lieutenant general until the Air Force addressed their questions concerning the move. The widespread opposition in Alaska to the squadron's move caused the Department of Defense to withdraw its recommendation and leave the squadron at Eielson.[7]
Air Force Outstanding Unit Awards: 1 June 1962 – 31 May 1964; 7 June 1966 – 8 June 1968; 1 January – 31 December 1978; 1 January 1983 – 30 June 1984; 1 July 1985 – 30 June 1987; 1 January 1988 – 31 December 1989; 1 July 1990 – 30 June 1992.