The first Philippine Army airfield (Zablan Airfield) was built outside of Manila, Luzon in 1935. At this time only three pilot trainers were available in the Philippines. Courses in flying and technical training were given in the mainland United States to selected students. After the war the airfield was closed and became Camp Emilio Aguinaldo. On 31 July 1941 the corps consisted of 2,132 enlisted troops, under the command of 275 officers: