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Major
U.S. Army,U.S. Marine Corps,U.S. Air Force, andU.S. Space Force insignia of the rank of Major. Style and method of wear vary between the services.
Shoulder boards
Country	United States
Service branch	U.S. Army U.S. Marine Corps U.S. Air Force U.S. Space Force
Abbreviation	MAJ(Army) Maj
Rank group	Field officer
NATOrank code	OF-3
Pay grade	O-4
Next higher rank	Lieutenant colonel
Next lower rank	Captain
Equivalent ranks	Lieutenant commander (U.S. Navy andU.S. Coast Guard)

In theUnited States Army,Marine Corps,Air Force andSpace Force,major is afield officer above therank ofcaptain and below the rank oflieutenant colonel. It is equivalent to the rank oflieutenant commander in theNavy andCoast Guard. Although lieutenant commanders are considered junior officers by their services, majors are senior officers.

Thepay grade for the rank of major is O-4. The insignia for the rank consists of a goldenoak leaf, with slight stylized differences between the versions of the different services. Promotion to the rank of major is governed by theDepartment of Defense policies derived from theDefense Officer Personnel Management Act of 1980.

A major in the U.S. Army typically serves as abattalionexecutive officer (XO) or as the battalionoperations officer (S3). Majors can also serve as company commanding officers, a major can also serve as a primary staff officer for aregiment,brigade ortask force in the areas concerning personnel, logistics, intelligence, and operations. A major will also be a staff officer / action officer on higher staffs and headquarters. In addition, majors command augmented companies in Combat Service and Service Support units. U.S. Army majors also commandspecial operations companies, such asU.S. Army Special Forces companies, Civil Affairs companies, Military Information Support Operations companies, and certain types of separate, numbered vice lettered,Military Intelligence companies.

In the 1830s, the Army selected an oak leaf as the rank insignia for a major, though the rationale for the choice remains unclear.^[1]

Selected majors in the United States Army attend the 10-monthCommand and General Staff School atFort Leavenworth, with a greater number attending satellite schools administered by Fort Leavenworth atFort Belvoir,Virginia andRedstone Arsenal, Alabama.^[2] 960 graduated from the Leavenworth course in 2009, at the time the largest class in Army history.^[3]

TheContinental Army mostly followed the organization and rank structure of the British Army. A regiment consisted of eight companies with three officers (a captain, lieutenant and ensign) and about 60 enlisted men each. The field-grade officers of a regiment were the colonel, the lieutenant colonel and a major. The major was the regiment's third in command and, at least in theory, would command one of the regiment's two battalions if the regiment were divided for tactical purposes.

During the American Civil War theUnion Army continued to use the existing titles of rank and rank insignia established for the U.S. Army. After the Southern states seceded and became theConfederacy, theConfederate army retained the same titles of rank as its U.S. counterpart, but developed anew system of rank identification and insignia for its officers.

While U.S. officers continued to wear their rank insignia on their shoulder straps, Confederate officers wore their rank insignia on the collar (one, two, or three horizontal gold bars for lieutenants and captains; one, two, or three gold stars for field grade officers; and three gold stars surrounded by a wreath for all general officers), as well as rows of gold lace forming anAustrian knot pattern on each sleeve. The number of rows of gold lace increased with the rank of the officer.

In the late 1800s the US Army changed from the traditional ten-company regiment to one of twelve companies organized into three four-company battalions, each commanded by a major. Prior to World War II, battalion commanders became lieutenant colonels. The basic regimental organization remained standard until after the Korean War, when regiments with organic battalions were no longer used as tactical units. Battalions attached to brigades replaced the regiment. Battalions commanded by lieutenant colonels became the US Army's basic tactical unit. As a result, there were only a limited number of command positions for majors although Medical,Special Forces and Aviation companies are usually commanded by majors.

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A major in the Air Force typically has duties as a senior staff officer at the squadron and wing level. In flying squadrons majors are generally flight commanders or assistant directors of operations. In the mission support and maintenance groups majors may occasionally be squadron commanders. In the medical corps, a major may be the head of a clinic or flight.

A major in the Space Force typically has duties as a senior staff officer at the squadron anddelta levels.

Manylaw enforcement agencies use major as a rank, including nearly everystate police agency, manysheriff's offices, and somecounty andmunicipal police departments. Examples include theOhio State Highway Patrol,Hillsborough County Sheriff's Office,DeKalb County Police Department, andBaltimore Police Department. Majors in law enforcement agencies usually command aprecinct or a larger element, such as a division or bureau (i.e., Patrol Division, Detective Bureau, etc.).

• 
  U.S. Army rank insignia of a major.
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  U.S. Marine Corps rank insignia of a major.
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  U.S. Air Force rank insignia of a major.
• 
  U.S. Space Force rank insignia of a major.

• Confederate Army rank insignia: A guide
• Officer rank insignia
• Rank history

• Military ranks of the United States Army
• Military ranks of the United States Marine Corps
• Officer ranks of the United States Air Force
• Officer ranks of the United States Space Force

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