This facsimile edition of the US 1942 field manual for tank destroyer units describes missions, organization, combat, and training. It scales its information from squad to company to battalion to group. Issued early during the United States' WWII experience, it predates the assignment of authorized tank destroyer gear: "It is prepared for the guidance of units that will be equipped with materiel now being developed..." Readers should recall that US WWII doctrine and the high command forbade tank vs. tank combat. The American tank was meant for targets other than Axis armor. However, tank destroyer units were specifically designed, equipped, and deployed to fight what we now think of as tank battles. This is an historic document that gives us deep insight into a long-forgotten military doctrine. For those who think of tank destroyers as cheap tanks or stopgaps, this will be an eye-opener.