List of instructions reporting openings for which applications will be accepted from veterans field manual Reference data / prepared under direction of the chief of engineers field manual Operations of engineer field units field manual Corps of engineers : construction and routes of communication field manual Military police in towns and cities field manual Air navigation / prepared under direction of the chief of the air corps field manual Weather field manual Reviews and inspection / Prepared under direction of the chief of the air corps Photomail operation - USA War Department Field Manual, FM 11-150 Advanced map and aerial photograph reading - USA Basic Field Manual, FM 21-26 field manual Browning machine gun caliber .30, HB, M1919A4 (mounted in combat vehicles) / prep. under dir. of the Chief of Infantry field manual Browning machine gun, caliber .30, M1917