The school taught bombardiers the technique of bomb sighting. Bombardiers were required to crawl down shafts that gave way to the "bubble," from which they had bird's-eye views of the ground below. The bombardier's job was to feed the bombsight the needed information, air speed, wind speed, wind direction, altitude, and the angle of drift. As the aircraft approached the target, the pilot turned the aircraft over to the bombardier and the Norden bombsight, which was also an automatic pilot that flew the aircraft as bombs were released over the target. Classroom instruction at the Albuquerque base was held at night and training missions were flown during the day to bombsights around Albuquerque. Servicemen and WPA workers were tasked with laying out bombing ranges for training. These were located west and southwest of Albuquerque, including a major range located between the neighboring village, Los Lunas and the Rio Puerco. Contracts for day and night bombing targets on the ranges were let during January 1942, and access roads to the targets were constructed. Bomb ranges numbered 2,450 square miles on ranch and Indian reservation land by the end of 1942. At that time, a total of 24 targets, simulated cities and warships, were in use on the ranges.