This manual prescribes the duties to be performed in the service of the 105mm Howitzer Motor Carriage, M37, by the personnel normally assigned to a howitzer section of an armored Field Artillery firing battery.
"This 1942 manual is published for the information and guidance of personnel using the 20mm aircraft gun materiel M1 and M2 and contains technical information requried in the identification, use, and care of the materiel."
Committee 13, Officers Advanced Course, Armored School; Osborne, Robert J. C.; Throckmorton, John W.; Killian, John J.; Carpenter, Robert W.; Reynolds, Walter E., Jr.; Williams, Frank A.; Young, Sidney H., Jr.; Cobb, John H., Jr.
"Since the invention of gunpowder, fortification has received various improvements, and many have been the books wrote upon this subject, which might incline one to think, that it was arrived to its utmost perfection. . . "