4.2 inch Mortar M2. FM 23-92 Field Artillery. Tactics and Technique. FM 6-20 field manual Field service regulations : operations / prepared under direction of the chief of staff Manual of field artillery exercises horse guards, 1st august 1861 field manual Field artillery tactics List of war department films, film strips, and recognition film slides, April 1945 - USA War Department Field Manual, FM 21-7 1982 pattern webbing : users field manual field manual Seacoast artillery field manual Criminal investigation Field service regulations : operations / prepared under direction of the chief of staff - USA Voorschrift, Field Manual 100-5 field manual Field service regulations : administration / prepared under direction of the chief of staff field manual Operations in snow and extreme cold / Prepared under direction of the Chief of Staff