NOAA Commissioned Officer Corps

The National Oceanic and Atmospheric Administration Commissioned Officer Corps (informally the NOAA Corps) is one of eight federal uniformed services of the United States, and operates under the National Oceanic and Atmospheric Administration (NOAA), a scientific agency overseen by the Department of Commerce. The NOAA Corps is made up of scientifically and technically trained officers. The NOAA Corps and the United States Public Health Service Commissioned Corps are the only U.S. uniformed services that consist only of commissioned officers, with no enlisted or warrant officer ranks. The NOAA Corps' primary mission is to monitor oceanic conditions, support major waterways, and monitor atmospheric conditions.

The NOAA Corps traces its origins to the establishment of the United States Coast and Geodetic Survey Corps on May 22, 1917, which the service recognizes as its official date of establishment. The Coast and Geodetic Survey Corps became the Environmental Science Services Administration Corps in 1965, which in turn became the NOAA Corps in 1970.

The NOAA Corps is the smallest of the eight uniformed services of the United States government. It has over 300 commissioned officers, but no enlisted or warrant officer personnel. The NOAA Corps today employs professionals trained in engineering, earth sciences, oceanography, meteorology, fisheries science, and other related disciplines. NOAA Corps officers operate NOAA ships, fly NOAA aircraft, manage research projects, conduct diving operations, and serve in staff positions throughout NOAA, as well as in positions in the United States Merchant Marine, the United States Department of Defense, the United States Coast Guard, the National Aeronautics and Space Administration, and the United States Department of State. Like its predecessors, the Coast and Geodetic Survey Corps and the ESSA Corps, the NOAA Corps provides a source of technically skilled officers which can be incorporated into the United States Armed Forces in times of war, and in peacetime supports defense requirements in addition to its non-military scientific projects. Should it be called into active duty, it would be a department of one of the six branches of the U.S. Armed Forces.

The NOAA Commissioned Officer Corps traces its roots to the United States Coast and Geodetic Survey, the oldest scientific agency of the federal government. The Coast and Geodetic Survey was founded as the United States Survey of the Coast under President Thomas Jefferson in 1807 and renamed the United States Coast Survey in 1836. Until the American Civil War (1861–1865), the Coast Survey was staffed by civilian personnel working with United States Army and United States Navy officers. During the American Civil War, Army officers were withdrawn from Coast Survey duty, never to return, while all but two Navy officers also were withdrawn from Coast Survey service for the duration of the war. Since most men of the Survey had Union sympathies, most stayed on with the Survey rather than resigning to serve the Confederate States of America; their work shifted in emphasis to support of the United States Navy and Union Army, and these Coast Surveyors are the professional ancestors of today's NOAA Corps. Those Coast Surveyors supporting the Union Army were given assimilated military rank while attached to a specific command, but those supporting the U.S. Navy operated as civilians and ran the risk of being executed as spies if captured by the Confederates while working in support of Union forces. After the war, U.S. Navy officers returned to duty with the Coast Survey, which was given authority over geodetic activities in the interior of the United States in 1871 and was subsequently renamed the United States Coast and Geodetic Survey in 1878.

With the outbreak of the Spanish–American War in April 1898, the U.S. Navy again withdrew all of its officers from Coast and Geodetic Survey assignments. They returned after the war ended in August 1898, but the system of U.S. Navy officers and men crewing the Survey's ships that had prevailed for most of the 19th century came to an end when the appropriation law approved on June 6, 1900, provided for "all necessary employees to man and equip the vessels," instead of U.S. Navy personnel. The law took effect on July 1, 1900; at that point, all U.S. Navy personnel assigned to the Survey's ships remained aboard until the first call at each ship's home port, where they transferred off, with the Survey reimbursing the Navy for their pay accrued after July 1, 1900. From July 1900, the Coast and Geodetic Survey continued as an entirely civilian-run organization until after the United States entered World War I in April 1917.

To avoid the dangers that Coast Survey personnel had faced during the Civil War of being executed as spies if captured by the enemy, the United States Coast and Geodetic Survey Corps was established on 22 May 1917, giving Coast and Geodetic Survey officers a commissioned status so that under the laws of war, they could not be executed as spies if they were captured while serving as surveyors on a battlefield during World War I. The creation of the Coast and Geodetic Survey Corps also ensured that in wartime a set of officers with technical skills in surveying could be assimilated rapidly into the United States Armed Forces so that their skills could be employed in military and naval work essential to the war effort. Before World War I ended in November 1918, over half of all Coast and Geodetic Survey Corps officers had served in the U.S. Army, U.S. Navy, or United States Marine Corps, performing duty as artillery orienteering officers, as minelaying officers in the North Sea (where they were involved in the laying of the North Sea Mine Barrage), as navigators aboard troop transports, as intelligence officers, and as officers on the staff of American Expeditionary Force commanding officer General John "Black Jack" Pershing.

The Coast and Geodetic Survey Corps returned to peacetime scientific pursuits after the war. Its first flag officer was Rear Admiral Raymond S. Patton, who was promoted from captain to rear admiral in 1936.

When the United States entered World War II in December 1941, the Coast and Geodetic Survey Corps again suspended its peacetime activities to support the war effort, often seeing front-line service. Over half of all Coast and Geodetic Survey officers were transferred to the U.S. Army, the United States Army Air Forces, the U.S. Navy, or the U.S. Marine Corps, and deployed in North Africa, Europe, the Pacific, and the defense of North America as artillery surveyors, hydrographers, amphibious engineers, beachmasters (i.e., directors of disembarkation), instructors at service schools, and in a wide variety of technical positions. They also served as reconnaissance surveyors for a worldwide aeronautical charting effort, and a Coast and Geodetic Survey officer was the first commanding officer of the Army Air Forces Aeronautical Chart Plant at St. Louis, Missouri. Three officers who remained in Coast and Geodetic Survey service were killed during the war, as were eleven other Survey personnel.