Grissom Air Reserve Base is a United States Air Force installation located near Bunker Hill, Indiana. Established in 1942 as Naval Reserve Air Base Peru, it underwent several name changes, including Naval Air Station Bunker Hill, before being transferred to the United States Air Force in 1954 and renamed Bunker Hill Air Force Base. It became Grissom Air Force Base in 1968, honoring astronaut Lieutenant Colonel Virgil I. "Gus" Grissom. The base was downsized to an Air Force Reserve installation and renamed Grissom Air Reserve Base in 1994, following a BRAC 1991 decision. It now functions as a joint-use civil airport and military base, with the Grissom Aeroplex handling civilian aviation. The primary operator is the US Air Force under the Air Force Reserve Command. The host unit is the 434th Air Refueling Wing, which operates KC-135R Stratotankers. Other units from the United States Army Reserve and US Marine Corps Reserve are also stationed at Grissom ARB. The base features a 3,810.3-meter asphalt runway. Notably, in 1964, a B-58 bomber carrying nuclear weapons crashed and caught fire on the base during a training mission, resulting in contamination and a fatality. The base was also listed as an emergency landing site for the Space Shuttle until 2011. Environmental investigations into groundwater contamination from perfluorinated compounds have been ongoing since 2015.