and throughout the week that the monarch spends in Edinburgh at both the castle and the Palace of Holyroodhouse. Sentries are also posted at the castle during the month of the Edinburgh Military Tattoo prior to each performance, with the regiment forming a guard of honour at the end of each performance. Public duties are performed by the Balaklava Company of the Royal Regiment of Scotland a single incremental company based permanently in Scotland for public duties. United States Washington, D.C. The 3rd U.S. Infantry Regiment is an official ceremonial unit of the United States Army, and has provided the escort for the President of the United States, as well as formally provides security for Washington, D.C. Public duties performed the by the regiment includes ceremonies at the White House, the Pentagon, and other national ceremonies throughout the capital and its neighbouring areas. The guard also provide military escorts for military funerals at Arlington National Cemetery, and a perpetual sentry at the Tomb of the Unknown Soldier since 1948. Other service branches of the United States Armed Forces also maintain their own units for public duties in Washington. Other states The United States Army installation, Fort Huachuca, maintains a ceremonial cavalry troop known as B Troop, 4th Cavalry Regiment. It is one of only four remaining in the Army, and is mounted ceremonies, parades, and public relations. B Troop, 4th Cavalry Regiment resides at the main post stables and conducts events around the southwestern United States. Troopers are volunteers soldiers stationed at Fort Huachuca. Prior to being issued their horse, carbine, and saber, each recruit must undergo a three-to-four month riding school. Once proficient in mounted drill, the recruit must demonstrate a proficiency in saber, and carbine/pistol accuracy. Only then does the recruit become a Trooper and is issued a horse. B Troop was specifically chosen as it was the Troop that captured Geronimo in 1886. A number of other military units from the United States National Guard, and state militias also maintain units which undertake public duties. The Governor's Guards of Connecticut is another unit which engages in public duties for the state, primarily in the capital of Hartford. Composed of two foot guard units and two horse guard units, the company-sized unit is a part of the Connecticut State Guard, which is a branch of the Connecticut State Militia. Public duties undertaken by the Governor's Guard include presidential,