Field artillery : tactics and technique of division artillery and higher artillery echelons - USA War Department Field Manual, FM 6-100 field manual Field artillery : forward observation field manual Field fortifications / prepared under direction of the chief of engineers field manual Corps of engineers : field fortifications field manual Tents and tent pitching field manual Armored engineer battalion field manual Engineer troops 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 Weather field manual Reviews and inspection / Prepared under direction of the chief of the air corps