field manual Examination for gunners / prepared under direction of the chief of the chemical warfare service Tactics and technique - USA Field Artillery Field Manual, FM 6-20 Field artillery : tactics and technique of division artillery and higher artillery echelons - USA War Department Field Manual, FM 6-100 Seacoast artillery : service of the piece 6 -inch gun on barbette carriage - USA Coast Artillery Field Manual, FM 4-75 field manual Field fortifications / prepared under direction of the chief of engineers 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 Air navigation / prepared under direction of the chief of the air corps 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