- A top-selling reference now updated and revised to include new and changed terminology of the U.S. Army More than 3,800 terms and acronyms that are key parts of the working language of the U.S. Army are defined in this invaluable guide. It includes handy references for enlisted and officer specialty classifications; the precedence of awards, decorations, and medals; examples of military-style letters and memorandums; and key Army and DOD website addresses. Essential for soldiers, defense contractors, and civilian employees.