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 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 field manual 81-MM mortar, MI / Prepared under direction of the chief of infantry field manual Barrage balloon : operation of matériel and employment of personnel field manual Watermanship field manual 81-MM mortar squad and platoon