Aerial refueling craft was eventually modified by Airspeed to Cobham's specification, for a non-stop flight from London to India, using in-flight refueling to extend the plane's flight duration. Meanwhile, in 1929, a group of U.S. Army Air Corps fliers, led by then Major Carl Spaatz, set an endurance record of over 150 hours with the "Question Mark" over Los Angeles. Between June 11 and July 4, 1930, the brothers John, Kenneth, Albert, and Walter Hunter set a new record of 553 hours 40 minutes over Chicago using two Stinson SM-1 Detroiters as refueler and receiver. Aerial refueling remained a very dangerous process
History of the US Army National Guard Act's mobilization provisions, making it possible to deploy National Guard units and individual members directly for overseas service in the event of a war, without having to draft them first. The 1933 law also changed the name of the Militia Bureau to the National Guard Bureau. In August 1940, the National Guard was ordered to federal service for 12 months in anticipation of American entry into World War II. More than 400,000 National Guardsmen were called up as parts of divisions or in non-divisional units, immediately doubling the size of the active-duty U.S. Army. 18 Army divisions, 80 separate regiments,