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The question is not very clear. "Troop" could refer to a unit of cavalry or fast-moving infantry and the size of units vary depending on the country, year and type.
Each US Infantry Division had a reconnisance unit called a Recon Troop. This was a company-size unit of about 200 men who were mechanized with jeeps and light armored vehicles that allowed fast movement.
Troop was a term used for cavalry units and I think also Armor units.