USAAF, and the school was redesignated the Combat Crew Training School. The Air Corps Ferrying Command was redesignated the Army Air Forces Ferrying Command in March 1942, a month after the AAC transferred the school from TWA training back to the military. The command was then redesignated the Air Transport Command in July 1942—the same month that the school was transferred from Albuquerque to Smyrna Army Airfield, Tennessee. Bombardier training With the departure of the 19th Bombardment Group from Albuquerque Army Air Base in the fall of 1941, Major General Arnold moved the military's bombardier school from Louisiana to Albuquerque for two reasons—good weather and the availability of vacant land on which to build bombing ranges. It was proclaimed the "World’s First Bombardier School", and on 24 December 1941 it was officially designated an Army Air Forces Advanced Flying School under the USAAF Western Flying Training Command. The 56th and 88th School Squadrons, the 9th Materiel Squadron, and the 92nd Quartermaster Battalion arrived the week after the Pearl Harbor Attack, followed shortly by the 383rd and 384th School Squadrons and the 459th Ordnance Company. The director of the school, Colonel John P. Ryan, was praised for rapidly organizing the nation's first permanent bombardier training school. Instructors, maintenance personnel, and cadets arrived so quickly that base operations such as engineering and supply had to be operated out of pyramidal tents lacking heat and protection from blowing sand. Other problems included lack of aircraft parking space and adequate lighting near the aircraft parking ramp. New construction projects began early in 1942, adding offices and housing quarters, ordnance storage, a photography lab, flightline buildings, and maintenance hangars. The base undertook paving and lighting of aircraft parking spaces, and scheduled the building of additional runways and taxiways. Students began training on twin-engine Beechcraft AT-11 Kansan bomber trainers. By January 1942, there were 50 aircraft on base, in addition to 28 B-18A Bolo bombers used for training. Eventually, about 150 AT-11s served the school. The USAAF established a new minimum proficiency standard for bombardier trainees in 1943. Trainees were required to hit their targets during at least 22 percent of their drops. Practice combat flying missions required continuous evasive action within a 10-mile radius of the intended target. The final approach was required to be straight, level and taking no longer than 60 seconds. The school taught bombardiers the technique of bomb sighting. Bombardiers were