Camp Roberts, in the Salinas Valley, is one of California's largest military training camps. Named for a heroic World War I tank driver, it took the threat of global war in 1940 to kick-start its construction. Soon Camp Roberts had a capacity to house and train 23,000 men. During the war, almost half a million men trained here. Row upon row of wooden buildings, replete with churches, stores, a hospital, and an amphitheater where A-list stars performed,...