Base Realignment and Closure (BRAC) was a process by a United States federal government commission to increase the efficiency of the United States Department of Defense by coordinating the realignment and closure of military installations following the end of the Cold War. Over 350 installations have been closed in five BRAC rounds: 1988, 1991, 1993, 1995, and 2005. These five BRAC rounds constitute a combined savings of $12 billion annually.

The Federal Property and Administrative Services Act of 1949, passed after the 1947 reorganization of the National Military Establishment, reduced the number of U.S. military bases, forts, posts, and stations. The subsequent 1950s buildup for the Cold War (e.g., during the Korean War) resulted in large numbers of new installations, such as the Permanent System radar stations and Semi-Automatic Ground Environment (SAGE) control centers. By 1959, plans for even larger numbers of Cold War installations were canceled (e.g., DoD's June 19, 1959, Continental Air Defense Program reduced the number of Super Combat Center underground nuclear bunkers to 7). In 1958, U.S. Intercontinental Ballistic Missiles (ICBMs) began to replace Strategic Air Command bombers. From 1960 to 1964, the Eisenhower and Kennedy administrations closed 574 U.S. military bases around the world, particularly after President John F. Kennedy was briefed after his inauguration that the missile gap was not a concern.

The Defense Base Realignment and Closure Act of 1990 provided "the basic framework for the transfer and disposal of military installations closed during the base realignment and closure (BRAC) process". The process was created in 1988 to reduce pork barrel politics with members of Congress that arise when facilities face activity reductions.

The most recent process began May 13, 2005, when Secretary of Defense Donald Rumsfeld forwarded his recommendations for realignments and closures to the Base Realignment and Closure (BRAC) Commission. The BRAC is an independent nine-member panel appointed by the President. This panel evaluated the list by taking testimony from interested parties and visiting affected bases. The BRAC Commission had the opportunity to add bases to the list and did so in a July 19, 2005, hearing. The Commission met its deadline of September 2005 to provide the evaluated list to the President, who approved the list with the condition that it could only be approved or disapproved in its entirety. On November 7, 2005, the approved list was then given to Congress, who had the opportunity to disapprove the entire list within 45 days by enacting a resolution of disapproval. This did not happen, and the BRAC Commission's recommendations became final.

The 1988 Base Realignment and Closure Commission included:

In 1990, the Navy considered cutting 34 military installations.

The 1991 Base Realignment and Closure Commission included:

The 1993 Base Realignment and Closure Commission included: