(military) second in command of a military unit or ship

A fellow police officer

A person assigned to manage a client's affairs. / In intelligence organisations, a person who manages a network of agents.

plural of customs officer

plural of case officer

plural of noncommissioned officer

A person holding a rank in the RAF, between that of pilot officer and flight lieutenant, equivalent to an Army lieutenant or Royal Navy sublieutenant.

The lowest rank of a commissioned officer in the RAF, equivalent to an Army ensign or coronet

press secretary

plural of peace officer