1) Royal Navy specialism 2) Senior naval rating 
A non-commissioned officer responsible for discipline on a naval ship. Standing between the officers and the crew, commonly known in the Royal Navy as 'the Buffer'.
A non-commissioned officer responsible for discipline on a naval ship. Standing between the officers and the crew, commonly known in the Royal Navy as 'the Buffer'.
A Master-at-Arms (MA) may be a naval rating responsible for law enforcement and force protection, an army officer responsible for physical training, or a member of the crew of a merchant ship (usually a passenger vessel) responsible for security and law enforcement. In some navies a `ship`s corporal” is a position, not the rank, of a petty of......
A non-commissioned officer responsible for discipline on a naval ship. Standing between the officers and the crew, commonly known in the Royal Navy as 'the Buffer'.
[n] - the senior petty officer
noun the senior petty officer; responsible for discipline aboard ship