MILITARY MEN by Ward Just. 256 pages, Knopf. $6.95.
What ever happened to the U.S. Army that once fought popular wars and always seemed to win Total Victory? Gone is the glory of Normandy, the Bulge and Okinawabattles in which, Ward Just recalls, there were "real heroes fighting real villains." In 1971, the Army is painfully on the defensive at home and in full psychological retreat in Viet Nam. Assessing the present plight of the military in an acute if contentious book, the Washington Post's former Viet Nam correspondent finds not a juggernaut but a jumble of men and machines in search...