Master Trooper
From Wikipedia, the free encyclopedia
Master Trooper is a rank used by several state police agencies within the United States and in some world militaries.
In particular, in the Louisiana State Police[1], in the United States, it is a rank below Sergeant, yet above Senior Trooper. The insignia for this rank consists of a gold colored 'MT' collar pin worn on the wearer's right lapel. Troopers who complete fifteen (15) years of satisfactory or exceptional service are promoted to the rank of Master Trooper. The title of address is "Master Trooper".
Usage in other agencies or countries may vary.