O-4 (United States military pay grade)

O-4 (United States military pay grade)
Name	O-4
Higher rank	O-5
Lower rank	O-3
Pay grade	O-4

Contents

O-4 (United States military pay grade) is the pay grade assigned to mid‑level commissioned officers across the United States Armed Forces branches, corresponding to field grade or mid‑career leadership positions in the United States Army, United States Marine Corps, United States Navy, United States Air Force, and United States Space Force. Holders at this grade typically command units or serve as staff officers in operational, training, or administrative roles for organizations such as the Department of Defense, United States Indo-Pacific Command, United States Central Command, United States Northern Command, and Joint Chiefs of Staff. The grade is recognized in statutes like the United States Code and influences assignments within institutions including the United States Military Academy, United States Naval Academy, National Defense University, and the Defense Logistics Agency.

Overview

O-4 denotes a commissioned officer pay grade established under provisions of the Pay Readjustment Act and administered per the Armed Forces Pay Act codified in the United States Code. Comparable to levels found in allied systems such as the British Army, Canadian Armed Forces, Australian Defence Force, and NATO rank codes, O-4 officers bridge tactical leadership found at the company or squadron level with operational planning at theater and joint staff echelons including United States European Command and United States Southern Command. Appointments at this grade are pivotal for assignments to organizations like the Federal Bureau of Investigation military liaison programs, the Central Intelligence Agency defense attaché corps, and multinational commands like NATO Allied Command Operations.

In the United States Army and United States Marine Corps, O-4 officers wear the rank of Major with a gold oak leaf insignia akin to ornaments used in ceremonies at sites such as the National World War II Memorial, Arlington National Cemetery, and Pentagon. In the United States Air Force and United States Space Force, the O-4 rank is also Major with the same gold oak leaf, displayed on uniforms issued at depots like the Defense Logistics Agency clothing supply centers and on flight suits used at bases including Edwards Air Force Base and Patrick Space Force Base. The United States Navy and United States Coast Guard designate O-4 as Lieutenant Commander and use a gold oak leaf with sleeve stripes on uniforms comparable to those worn aboard vessels like USS Gerald R. Ford (CVN-78) and USCGC Bertholf (WMSL-750), as regulated by the Navy Uniform Regulations and Coast Guard Uniform Regulations.

O-4 officers serve as battalion or squadron staff officers, company commanders, department heads, and division planners within formations such as the 1st Infantry Division, 3rd Marine Aircraft Wing, Carrier Strike Group 12, 354th Fighter Wing, and Space Launch Delta 45, performing duties that interface with agencies including the Defense Intelligence Agency, National Security Agency, United States Special Operations Command, and United States Transportation Command. Responsibilities often include operational planning for campaigns like Operation Iraqi Freedom, Operation Enduring Freedom, Operation Inherent Resolve, and participation in exercises such as RIMPAC, Red Flag, and Vigilant Shield. They advise senior leaders such as commanders at Fort Bragg or admirals aboard USS Nimitz (CVN-68), supervise training per standards from the U.S. Army Training and Doctrine Command and Marine Corps Combat Development Command, and manage logistics coordinated with the Defense Logistics Agency.

The grade corresponds to service titles: in the United States Army and United States Marine Corps it is Major; in the United States Air Force and United States Space Force it is Major; and in the United States Navy and United States Coast Guard it is Lieutenant Commander. NATO uses the code OF-3 for similar ranks in forces like the Bundeswehr, Armee de Terre (France), Canadian Army, and Royal Navy, aligning O-4 duties with counterparts in multinational formations such as NATO Response Force and bilateral staff exchanges with the Japan Self-Defense Forces and Republic of Korea Armed Forces.

Promotion to O-4 generally follows selection boards convened under policies from the Defense Officer Personnel Management Act and the Uniform Code of Military Justice administrative framework, with timing influenced by time‑in‑grade, fitness reports from commands like U.S. Army Forces Command and Marine Forces Pacific, professional military education at institutions such as the Command and General Staff College, Naval War College, Air Command and Staff College, and joint schooling at the National War College. Career paths often lead from O-3 positions in units like the 82nd Airborne Division or aboard ships like USS Constitution to O-4 billets, and successful O-4s may be competitive for selection to O-5 and O-6 ranks influencing assignments to commands such as U.S. Central Command and senior staff at the Pentagon.

Compensation for O-4 officers is set by statutes in the United States Code and adjusted pursuant to actions by Congress and the President, with entitlements including basic pay, housing allowances administered via the Defense Finance and Accounting Service, subsistence allowances, and special pays for assignments to hazardous duty areas like Afghanistan or sea duty aboard deployable units such as Amphibious Ready Groups. Benefits also cover retirement under the Blended Retirement System, healthcare through TRICARE, education assistance via the GI Bill, and relocation support coordinated with the Defense Logistics Agency and Base Realignment and Closure processes.

The O-4 pay grade evolved from 19th‑century commissioned structures formalized during reforms such as the Officer Personnel Act and later codified in the Officer Personnel Act of 1947, reflecting changes after conflicts like the American Civil War, World War I, World War II, and the Korean War that reshaped rank responsibilities in formations including the Army Ground Forces and Fleet Forces Command. Subsequent legislation and policy responses to operations like Operation Desert Storm and doctrinal shifts following the Goldwater–Nichols Act further refined promotion timing, insignia standardization, and joint duty credit affecting O-4 officers serving in joint headquarters such as U.S. Central Command and multinational staffs within NATO.