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,
Lieutenant colonel (United States) case with George A. Custer, who was a lieutenant colonel in the regular army, but held the brevet rank of major general. The 20th century saw lieutenant colonel in its present-day status although, during the 1930s, many officers again found the rank to be terminal as the rank of colonel was reserved for only a select few officers. In the United States Army and the United States Marine Corps (USMC), a lieutenant colonel typically commands a battalion/squadron-sized unit (300 to 1,200 Soldiers/Marines), with a major as executive officer (XO) and a command sergeant major/sergeant major (USMC) as principal NCO or