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A troop is a military unit, originally a small force of cavalry, subordinate to a squadron. In many armies a troop is the equivalent unit to the infantry section or platoon. Exceptions are the Royal Horse Artillery and the US Cavalry, where troop refers to an infantry company or artillery battery.
A related sense of the term troop refers to members of the military collectively, as in the troops; see Troop (disambiguation).
Today, a troop is defined differently in different armed forces.
The SASR is the only unit in the Royal Australian Infantry Corps to use the term troop to refer to its platoon size elements. SASR troops are also unusual as they are commanded by a captain—most troop/platoon sized elements are commanded by a lieutenant. In all cases, units which refer to platoon sized elements as troops refer to company-sized elements as squadrons and battalion-sized elements as regiments. Privates in the RAAC and SASR hold the rank "trooper", however this is not the case for any other Corps/units which use the term troops.
Other army corps do not use the term.
In the Canadian Army, a troop is the equivalent of a platoon within the armoured, artillery, engineer, and signals branches. Two to four troops comprise the main elements of a squadron.
In the United States Army, in the cavalry branch, a troop is the equivalent unit to the infantry company, commanded by a captain and consisting of three or four platoons, and subordinate to a squadron (battalion). Companies were renamed troops in 1883.
In the United States, state police forces are often regionally divided into troops. This usage came about from these organizations modelling themselves on the US Army, and especially the older cavalry units. For this same reason the state police and highway patrol personnel of most states are known as "trooper" rather than "officer".