The 134th Fighter Squadron, nicknamed the Green Mountain Boys, is a unit of the Vermont Air National Guard 158th Fighter Wing located at Burlington Air National Guard Base, Burlington, Vermont. From 1986 to 2019, the 134th FS were equipped with the General Dynamics F-16C/D Fighting Falcon Block 30. The last F-16s departed Burlington on 6 April 2019 in preparation for the Lockheed Martin F-35A Lightning II which arrived on 19 September 2019. Since becoming an F-35A unit, the Green Mountain Boys are tasked with carrying out the Suppression of Enemy Air Defenses (SEAD).

The Vermont Air National Guard (VT ANG) is the aerial militia of the State of Vermont, United States of America. It is, along with the Vermont Army National Guard, an element of the Vermont National Guard. The 158th Fighter Wing is its sole unit. It is under the jurisdiction of the Governor of Vermont through the office of the Vermont Adjutant General unless they are federalized by order of the President of the United States. The Vermont Air National Guard is headquartered at Burlington Air National Guard Base. As of 2019, the Vermont Air National Guard is the first Air National Guard unit to be assigned the Lockheed Martin F-35A Lightning II.