units mounting the guard need to be infantry trained. On occasion, other units from the British Army and Royal Navy have provided the guard. Additionally, other units from the armed forces of several Commonwealth countries have formed the guard. Other British Army units Several other British Army units have also formed the guard. Prior to Options for Change, because there were a total of eight guards battalions, it was rare for battalions of line infantry to mount the King's Guard and, as such, was a significant honour. Before 1996, only two battalions had served on public duties as part of an operational tour in London District. However, when the 2nd Battalions of the Grenadier Guards, Coldstream Guards and Scots Guards were put in suspended animation, a decision to replace one of the three Foot Guard battalions then engaged on public duties by a line infantry battalion was taken, so as to enable the Foot Guards battalion to increase the proportion of its effort employed on training for operational roles. From 1996 to 2013, a line infantry battalion was stationed in London (first at Hounslow, then Woolwich) under the command of London District: Since 2013, regular public duties responsibility has reverted to the Household Division. However, line infantry units occasionally provide the Guard for short periods of time. The Royal Gibraltar Regiment is a line infantry regiment and home defence unit of British Forces Gibraltar, that formed the Queen's Guard in March 2001, April 2012 and March 2022. In 2012, the Royal Gibraltar Regiment became the first unit to provide both the Queen's Guard and the Saluting Battery simultaneously. In the summer of 2018, Balaklava Company, the dedicated public duties unit of the Royal Regiment of Scotland, and 2nd Battalion, The Rifles, both provided the Guard at Buckingham Palace and Windsor Castle. Units from the Army Reserve, and its predecessor, the Territorial Army, have also formed the guard. In 1938, the Honourable Artillery Company, a Territorial Army unit, provided the King's Guard. The same regiment subsequently provided the Queen's Guard in 1958. In June 2015, soldiers from the 3rd Battalion, Royal Welsh, provided the Tower of London detachment of the Queen's Guard. The following is a list of units of the line infantry regiments that have formed the King's Guard: The following is a list of Gurkha units that have formed the guard: Other British armed units On 14 May 1941,