United States Army Air Corps

The United States Army Air Corps was the aerial warfare service component of the United States Army between 1926 and 1941. After World War I, as early aviation became an increasingly important part of modern warfare, a philosophical rift developed between more traditional ground-based army personnel and those who felt that aircraft were being underutilized and that air operations were being stifled for political reasons unrelated to their effectiveness. The USAAC was renamed from the earlier United States Army Air Service on 2 July 1926, and was part of the larger United States Army. The Air Corps became the United States Army Air Forces on 20 June 1941, giving it greater autonomy from the Army's middle-level command structure. During World War II, although not an administrative echelon, the Air Corps remained as one of the combat arms of the Army until 1947, when it was legally abolished by legislation establishing the Department of the Air Force.
The Air Corps was renamed by the United States Congress largely as a compromise between the advocates of a separate air arm and those of the traditionalist Army high command who viewed the aviation arm as an auxiliary branch to support the ground forces. Although its members worked to promote the concept of air power and an autonomous air force in the years between the world wars, its primary purpose by Army policy remained support of ground forces rather than independent operations.
On 1 March 1935, still struggling with the issue of a separate air arm, the Army activated the General Headquarters Air Force for centralized control of aviation combat units within the continental United States, separate from but coordinate with the Air Corps. The separation of the Air Corps from control of its combat units caused problems of unity of command that became more acute as the Air Corps enlarged in preparation for World War II. This was resolved by the creation of the Army Air Forces, making both organizations subordinate to the new higher echelon.
On 20 June 1941, the Army Air Corps' existence as the primary air arm of the U.S. Army changed to that of solely being the training and logistics elements of the then-new United States Army Air Forces, which embraced the formerly-named General Headquarters Air Force under the new Air Force Combat Command organization for front-line combat operations; this new element, along with the Air Corps, comprised the USAAF.
The Air Corps ceased to have an administrative structure after 9 March 1942, but as "the permanent statutory organization of the air arm, and the principal component of the Army Air Forces," the overwhelming majority of personnel assigned to the AAF were members of the Air Corps.

Creation of the Air Corps

The U.S. Army Air Service had a brief but turbulent history. Created during World War I by executive order of President Woodrow Wilson after America entered the war in April 1917 as the increasing use of airplanes and the military uses of aviation were readily apparent as the war continued to its climax, the U.S. Army Air Service gained permanent legislative authority in 1920 as a combatant arm of the line of the United States Army. There followed a six-year struggle between adherents of airpower and the supporters of the traditional military services about the value of an independent Air Force, intensified by struggles for funds caused by skimpy budgets, as much an impetus for independence as any other factor.
The Lassiter Board, a group of General Staff officers, recommended in 1923 that the Air Service be augmented by an offensive force of bombardment and pursuit units under the command of Army general headquarters in time of war, and many of its recommendations became Army regulations. The War Department desired to implement the Lassiter Board's recommendations, but the administration of President Calvin Coolidge chose instead to economize by radically cutting military budgets, particularly the Army's. The Lampert Committee of the House of Representatives in December 1925 proposed a unified air force independent of the Army and Navy, plus a department of defense to coordinate the three armed services. However another board, headed by Dwight Morrow, was appointed in September 1925 by Coolidge ostensibly to study the "best means of developing and applying aircraft in national defense" but in reality to minimize the political impact of the pending court-martial of Billy Mitchell. It declared that no threat of air attack was likely to exist to the United States, rejected the idea of a department of defense and a separate department of air, and recommended minor reforms that included renaming the air service to allow it "more prestige".
In early 1926 the Military Affairs Committee of the Congress rejected all bills set forth before it on both sides of the issue. They fashioned a compromise in which the findings of the Morrow Board were enacted as law, while providing the air arm a "five-year plan" for expansion and development. Maj. Gen. Mason Patrick, the Chief of Air Service, had proposed that it be made a semi-independent service within the War Department along the lines of the Marine Corps within the Navy Department, but this was rejected; only the cosmetic name change was accepted. The legislation changed the name of the Air Service to the Air Corps, "thereby strengthening the conception of military aviation as an offensive, striking arm rather than an auxiliary service."
File:USAAC,1930.jpg|thumb|Formations of Keystone LB-7s and Boeing P-12s on aerial maneuvers over Burbank, California, 1930
The Air Corps Act became law on 2 July 1926. In accordance with the Morrow Board's recommendations, the act created an additional Assistant Secretary of War to "help foster military aeronautics", and established an air section in each division of the General Staff for a period of three years. Two additional brigadier generals would serve as assistant chiefs of the Air Corps. Previous provisions of the National Defense Act of 1920 that all flying units be commanded only by rated personnel and that flight pay be awarded were continued. The Air Corps also retained the "Prop and Wings" as its branch insignia through its disestablishment in 1947. Patrick became Chief of the Air Corps and Brig. Gen. James E. Fechet continued as his first assistant chief. On 17 July 1926, two lieutenant colonels were promoted to brigadier general for four-year terms as assistant chiefs of Air Corps: Frank P. Lahm, to command the new Air Corps Training Center, and William E. Gillmore, in command of the Materiel Division.
Of the new law and organization, however, Wesley F. Craven and James L. Cate in the official history of the United States Army Air Forces concluded that:

The bill which was finally enacted purported to be a compromise, but it leaned heavily on the Morrow recommendations. The Air Corps Act of 2 July 1926 effected no fundamental innovation. The change in designation meant no change in status: the Air Corps was still a combatant branch of the Army with less prestige than the Infantry.

The position of the air arm within the Department of War remained essentially the same as before, that is, the flying units were under the operational control of the various ground forces corps area commands and not the Air Corps, which remained responsible for procurement and maintenance of aircraft, supply, and training. Because of a lack of legally specified duties and responsibilities, the new position of Assistant Secretary of War for Air, held by F. Trubee Davison from July 1926 to March 1933, proved of little help in promoting autonomy for the air arm.

Five-year expansion program

The Air Corps Act gave authorization to carry out a five-year expansion program. However, a lack of appropriations caused the beginning of the program to be delayed until 1 July 1927. Patrick proposed an increase to 63 tactical squadrons to maintain the program of the Lassiter Board already in effect, but Chief of Staff Gen. John Hines rejected the recommendation in favor of a plan drawn up by ground force Brig. Gen. Hugh Drum that proposed 52 squadrons. The act authorized expansion to 1,800 airplanes, 1,650 officers, and 15,000 enlisted men, to be reached in regular increments over a five-year period. None of the goals was reached by July 1932. Neither of the relatively modest increases in airplanes or officers was accomplished until 1938 because adequate funds were never appropriated and the coming of the Great Depression forced reductions in pay and modernization across the board in the Army. Organizationally the Air Corps doubled from seven to fifteen groups, but the expansion was meaningless because all were seriously understrength in aircraft and pilots.

Group	Station	Date activated	Aircraft type
18th Pursuit Group	Wheeler Field, Hawaii	20 January 1927	PW-9
7th Bombardment Group	Rockwell Field, California	1 June 1928	LB-7, B-3A
12th Observation Group	Brooks Field, Texas	1 October 1930	O-19
20th Pursuit Group	Mather Field, California	15 November 1930	P-12
8th Pursuit Group	Langley Field, Virginia	1 April 1931	P-6
17th Pursuit Group	March Field, California	1 July 1931	P-12
19th Bomb Group	Rockwell Field, California	24 June 1932	B-10
16th Pursuit Group	Albrook Field, Canal Zone	1 December 1932	P-12
10th Transport Group	Patterson Field, Ohio	20 May 1937	C-27 C-33

As units of the Air Corps increased in number, so did higher command echelons. The 2nd Wing, activated in 1922 as part of the Air Service, remained the only wing organization in the new Air Corps until 1929, when it was redesignated the 2nd Bombardment Wing in anticipation of the activation of the 1st Bombardment Wing, providing a bombardment wing on each coast. The 1st Bomb Wing was activated in 1931, followed by the 3rd Attack Wing in 1932, protecting the southern border, at which time the 1st became the 1st Pursuit Wing. The three wings became the foundation of General Headquarters Air Force upon its activation in 1935.