seems to be suggested, but by no means mandated, by the Founding Fathers in the Fifth Amendment to its constitution. Members of the U.S. armed forces are subject to the Uniform Code of Military Justice. Male non-commissioned military personnel convicted by courts martial and sentenced to five or more years' confinement, male commissioned officers and male prisoners convicted of offenses related to national security end up at the United States Disciplinary Barracks at Fort Leavenworth, Kansas. Enlisted male military convicts who received sentences of less than five years are confined at various regional confinement facilities operated by the U.S. military both in the continental United States and abroad. All female military personnel convicted of felonies serve their sentences at the Naval Consolidated Brig, Miramar located at the Marine Corps Air Station Miramar near San Diego, California. In former times, criminals in the naval service were sent to the once-infamous Portsmouth Naval Prison, which was closed in 1974. Today's American military prison systems are designed to house criminals who commit an offense while holding the job title of being in a branch of the military. Military prisons have a tier system that is based on the length of a prisoner's sentence. For instance, the Navy uses three levels of incarceration. Tier I prisoners have been sentenced up to one year and are housed at a waterfront brig, an afloat brig, correctional custody units (CCU) and pre-trial confinement facilities. Tier II prisoners are transferred to one of the Navy's two consolidated brigs with sentences of up to 10 years. Lastly, female prisoners serve their time apart from men at a facility called NAVCONBRIG Miramar to better facilitate the rehabilitative process; while military prisoners with sentences over 10 years or who are sentenced to death are held at the U.S. disciplinary barracks. This tier system based on sentence length differs from typical American prisons which are characterized by their level of security. These different levels of security have to do with the type of criminals in the facility. Minimum security facilities typically have criminals convicted of white-collar crimes, or low-level drug offenses, while medium- and maximum-security prisons house more serious offenders that committed more violent crimes. Data from the Bureau of Justice Statistics breaks down military prisoners by five different military branches. This data showed 829 prisoners from the Army, 396 prisoners from the Marine Corps, 268 prisoners from the Navy, 21 prisoners