Field officer rank category (OF-3 to OF-5) of the Russian Imperial Army and Navy until 1917. The British Army (in which these officers are called officers of field rank), and some others in the Commonwealth (including the Australian Army and New Zealand Army), also include the brigadier in this category: the equivalent in other armies is a general officer (the brigadier general). Today, a field officer in the United States (here called field grade) Army, Marine Corps, and Air Force is typically a major, lieutenant colonel, or a colonel: Field officer A field officer, field-grade officer, or senior officer is an army,
Major Major Major is a military rank of commissioned officer status, with corresponding ranks existing in many military forces throughout the world. When used unhyphenated, in conjunction with no other indicators, major is one rank senior to that of an army captain, and one rank subordinate or below the rank of lieutenant colonel. It is considered the most junior of the field officer ranks. Majors are typically assigned as specialised executive or operations officers for battalion-sized units of 300 to 1,200 soldiers. In some militaries, notably France and Ireland, the rank of major is referred to as "commandant", while in others