The United States Army Air Corps (USAAC) was a forerunner of the United States Air Force. Renamed from the Air Service on 2 July 1926, it was part of the United States Army and the predecessor of the United States Army Air Forces (USAAF), established in 1941. Although abolished as an organization in 1942, the Air Corps (AC) remained as a branch of the Army until 1947.

The Air Corps was renamed by the United States Congress largely as a compromise between advocates of a separate air arm and those of the 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 airpower and an autonomous air force between 1926 and 1941, its primary purpose by Army policy remained support of ground forces rather than independent operations.

On March 1, 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 on 20 June 1941, when both organizations became subordinate to the new higher echelon.

The United States Army is the main branch of the United States Armed Forces responsible for land-based military operations. It is the largest and oldest established branch of the U.S. military, and is one of seven U.S. uniformed services. The modern Army has its roots in the Continental Army which was formed on 14 June 1775, before the establishment of the United States, to meet the demands of the American Revolutionary War. The Congress of the Confederation officially created the United States Army on 3 June 1784 after the end of the Revolutionary War to replace the disbanded Continental Army. The Army considers itself to be descended from the Continental Army and thus dates its inception from the origins of that force.

The primary mission of the army is "to fight and win our Nation’s wars by providing prompt, sustained land dominance across the full range of military operations and spectrum of conflict in support of combatant commanders." The Army is a military service within the Department of the Army, one of the three military departments of the Department of Defense. The army is headed by the Secretary of the Army, and the top military officer in the department is the Chief of Staff of the Army. The highest ranking army officer is currently the Chairman of the Joint Chiefs of Staff. During fiscal year 2010, the Regular Army reported a strength of 561,979 soldiers; the Army National Guard (ARNG) reported 362,015 and the United States Army Reserve (USAR) reported 205,281 putting the combined component strength total at 1,129,275 soldiers.

The United States of America (commonly abbreviated to the United States, the U.S., the USA, America, and the States) is a federal constitutional republic comprising fifty states and a federal district. The country is situated mostly in central North America, where its forty-eight contiguous states and Washington, D.C., the capital district, lie between the Pacific and Atlantic Oceans, bordered by Canada to the north and Mexico to the south. The state of Alaska is in the northwest of the continent, with Canada to the east and Russia to the west, across the Bering Strait. The state of Hawaii is an archipelago in the mid-Pacific. The country also possesses several territories in the Pacific and Caribbean.

At 3.79 million square miles (9.83 million km²) and with over 312 million people, the United States is the third or fourth largest country by total area, and the third largest by both land area and population. It is one of the world's most ethnically diverse and multicultural nations, the product of large-scale immigration from many countries. The U.S. economy is the world's largest national economy, with an estimated 2011 GDP of $15.1 trillion (22% of nominal global GDP and over 19% of global GDP at purchasing-power parity). Per capita income is the world's sixth-highest.

Army Air Corps may refer to the following army aviation corps:

Harry Lillis "Bing" Crosby (May 3, 1903 – October 14, 1977) was an American singer and actor. Crosby's trademark bass-baritone voice made him one of the best-selling recording artistes of the 20th century, with over half a billion records in circulation.

A multimedia star, from 1934 to 1954 Bing Crosby was a leader in record sales, radio ratings and motion picture grosses. His early career coincided with technical recording innovations; this allowed him to develop a laid-back, intimate singing style that influenced many of the popular male singers who followed him, including Perry Como,Frank Sinatra, and Dean Martin. Yank magazine recognized Crosby as the person who had done the most for American G.I. morale during World War II and, during his peak years, around 1948, polls declared him the "most admired man alive," ahead of Jackie Robinson and Pope Pius XII. Also in 1948, the Music Digest estimated that Crosby recordings filled more than half of the 80,000 weekly hours allocated to recorded radio music.