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,
Army officer ranks OR ranks between countries), the codes still provide a useful gauge in determining what ranks are broadly equivalent. These are the highest ranks. Promotion to OF-10 rank is now rare and usually reserved for wartime. Note that there is doubt about rank equivalency in countries that have no brigadier-generals but both colonel-generals and full generals, such as the German Empire and Russia - often it is considered that in these countries a colonel-general equates to an OF-9 rank, a general to OF-8, a lieutenant-general to OF-7, and a major-general to OF-6 (i.e. the ranks below colonel-general all move down one