Master sergeant

In the Marine Corps, Master Sergeants may be referred to by the nickname of "Top". This usage is an informal one, however, and would not be used in an official or formal setting. Use of this nickname by Marines of subordinate rank is at the rank holder's discretion.

All Master Sergeants are senior non-commissioned officers.

Known Master Sergeant's

 * Master Sergeant Lister
 * Master Sergeant Gunns