Troop \Troop\, v. t.

To troop the colors or colours (Mil.), in the British army, to perform a ceremony consisting essentially in carrying the colors, accompained by the band and escort, slowly before the troops drawn up in single file and usually in a hollow square, as in London on the sovereign's birthday. Trooper \Troop"er\, n. A mounted policeman. [Australia]

Note: The black troopers of Queensland are a regiment of aboriginal police, employed chiefly for dispersing wild aborigines who encroach on sheep runs.

Source: Webster's Revised Unabridged Dictionary (1913)