The last time there was a War Department, Hollywood still made most of its movies in black and white, and Americans were falling in love with a new entertainment device called the TV set. They cost an average of $400 each. The year was 1949. In at least one respect, Defense Secretary Pete Hegseth wants to turn the calendar back to that time. The nation’s military forces were organized under the War Department, and Hegseth believes that term, with its bold martial overtones, better suits his desire to remake the armed services to emphasize fighting and killing. The Trump administration...