United States Disciplinary Barracks

The United States Disciplinary Barracks (USDB), sometimes called Leavenworth, confines personnel of the Army, Navy, Air Force, Marine Corps and Coast Guard convicted by courts martial for violations of the Uniform Code of Military Justice. The USDB is located at Fort Leavenworth, Kansas near the cities of Leavenworth and Lansing. The USDB is a maximum security prison and houses convicted commissioned officers, enlisted prisoners serving sentences longer than 5 years, and prisoners convicted of offenses related to national security. Enlisted prisoners with sentences of under 5 years are housed in smaller facilities, such as the Regional Correction Facility at Fort Knox, Kentucky or the Marine Corps Brig at Quanitico, Virginia.

The Fort Leavenworth location was originally known as the United States Military Prison, and was established by an act of Congress in 1874. It has been in continuous operation since May 15, 1875, with a new 521-bed facility opened in 2002.

The historic confinement building, known as "the Castle", was built by the convicts and completed in 1921. It housed up to 1,500 prisoners. Demolition of the Castle started in 2004 and was expected to take about one year. There is a cemetery on the grounds, the Fort Leavenworth Military Prison Cemetery, which saw its last burial in 1957.

USDB was the first prison in the nation to offer vocational training for prisoners.

The last execution at the prison was Army Pfc. John A. Bennett, who was executed by hanging on April 13, 1961; his was also the most recent execution conducted by the United States Armed Forces.