master-at-arms

noun

1. 1

   A warrant officer or chief petty officer responsible for discipline aboard a naval ship.

2. 2

   A commissioned officer responsible for overseeing all fitness training in subordinate units.

3. 3

   A petty officer responsible for law enforcement, antiterrorism, force protection, and expeditionary warfare.

4. 4

   An officer in a fraternal or similar organization charged with maintaining order.