A field officer, field grade officer, or senior officer is an
commissioned officer senior in rank to a
company officer but junior to a
 In most armies this corresponds to the
lieutenant colonel and
colonel, or their equivalents. Some countries also include
brigadier in the definition.
battalion's field officers made up its command element.
Canadian Armed Forces, the equivalent of field officers are
senior officers (
French: Officiers supérieurs); they include the army and air force ranks of Major, Lieutenant-Colonel, and Colonel, and the naval ranks of