Captain (United States)
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In the United States uniformed services, captain is a commissioned officer rank. In keeping with the traditions of the militaries of most nations, the rank varies between the services, being a senior rank in the naval services and a junior rank in the ground and air forces.
For the naval rank, a captain is a senior officer of pay grade O-6 (the sixth officer rank), typically commanding seagoing vessels, major aviation commands and shore installations. This rank is used by the U.S. Navy, U.S. Coast Guard, U.S. Public Health Service Commissioned Corps, the NOAA Commissioned Corps, and the U.S. Maritime Service.
Of note, and to further complicate the confusion, seaborne services of the United States and many other nations refer to the officer in charge of any seagoing vessel as "captain" regardless of actual rank. While not an official rank as in pay grade it is an official title and can confuse many individuals that are new to or unfamiliar with naval traditions. One exception to this is when an officer of higher rank than captain, such as admiral, is the officer in charge of one or more seagoing vessel(s), such as a Carrier battle group. An admiral is never referred to as "captain." An additional item of note is that in the seaborne services, especially the submarine service, the commanding officer is often referred to informally as "skipper" whether the officer is a captain or below.
For the ground and air forces rank, a captain is of pay grade O-3 (the third officer rank), usually serving as the commander of a company-sized unit in the ground forces, as a flight leader or other squadron officer in air units, or serving as an executive officer or staff officer for a larger unit such as a battalion or squadron. This rank is used by the U.S. Army, U.S. Air Force, and U.S. Marine Corps.
The rank of captain may also be used in other organizations outside of the military, particularly in fire departments, police, and law enforcement.
Captain (Ground and Air Forces)
During the American Civil War, the rank of Captain was used in both the Union Army and Confederate States Army. The rank was typically held by either junior staff officers or company commanders. In the case of the latter, company officers were normally elected by the men of their unit, unless the officer in question held rank in the Regular Army. In cases where regiments had suffered high casualties, it was not not uncommon for a captain to assume duties as the regimental commander. Such was the case in the 1st Mississippi Infantry which was commanded by Captain Owen Hughes after the regiment had lost over half its number at the Battle of Nashville.
Rank equivalency between services
Due to the ambiguity created by the common use of "captain" for officers of different grades between the Army, Navy, Air Force, Marine Corps, and Coast Guard, equivalency is conferred between officers by use of identical pay grade rather than title of rank. The higher the grade, the higher the rank of the officer. For example, an Army, Air Force, or Marine captain is equivalent in rank, responsibilities, and grade to a Navy or Coast Guard lieutenant, all of which are of the third officer grade, or O-3. Similarly, a Navy or Coast Guard captain is equivalent in rank, responsibilities, and grade to an Army, Air Force, or Marine colonel, all of which are of the sixth officer grade, or O-6. Thus, Army, Air Force, and Marine colonels together with Navy and Coast Guard captains wear the silver eagle insignia of the grade of O-6, while Army, Air Force, and Marine captains together with Navy and Coast Guard lieutenants wear the double silver bars of the rank insignia of the grade of O-3. Additionally, the O-6 rank of Navy and Coast Guard captain is abbreviated as uppercase "CAPT", while the O-3 rank of captain is abbreviated as "CPT" for the Army and mixed-case "Capt" for the Air Force and Marine Corps.
In the United States, the rank of captain first appeared in the Continental Army during the Revolutionary War. A captain was the officer placed in charge of a company of soldiers and was granted a commission from the regimental colonel. A captain was afforded one to several lieutenants, depending on the size of the company, and the captain’s commission could be revoked or expired at the end of a particular military campaign.
The Continental Navy used the rank of captain as the commander of a sailing vessel at war, with the captain having several lieutenants on board, as well as a Sailing Master to assist in their duties. This use of the rank carried over into the U.S. Navy. With the addition of the ranks of commander and lieutenant commander between lieutenant and captain, a Navy captain became equivalent in rank to an Army colonel.
|United States uniformed services commissioned officer and officer candidate ranks|
|Pay grade / branch of service||Officer
|Army||CDT / OC||2LT||1LT||CPT||MAJ||LTC||COL||BG||MG||LTG||GEN||GA||GAS|
|Marine Corps||Midn / Cand||2ndLt||1stLt||Capt||Maj||LtCol||Col||BGen||MajGen||LtGen||Gen|||||
|Navy||MIDN / OC||ENS||LTJG||LT||LCDR||CDR||CAPT||RDML||RADM||VADM||ADM||FADM||AN|
|Air Force||Cadet / OT / OC||2d Lt||1st Lt||Capt||Maj||Lt Col||Col||Brig Gen||Maj Gen||Lt Gen||Gen||GAF|||
|Coast Guard||CDT / OC||ENS||LTJG||LT||LCDR||CDR||CAPT||RDML||RADM||VADM||ADM|||||
|Public Health Service||[OC]||ENS||LTJG||LT||LCDR||CDR||CAPT||RADM||RADM||VADM||ADM|||||
Unofficial 1945 proposal for General of the Armies insignia; John J. Pershing's GAS insignia: ; George Dewey's AN insignia:
 Rank used for specific officers in wartime only, not permanent addition to rank structure
 Grade is authorized by the U.S. Code for use but has not been created
 Grade has never been created or authorized
|United States warrant officer ranks|
|Public Health Service|||||||||||
|National Oceanic and
 Grade is authorized for use by U.S. Code but has not been created
 Grade never created or authorized