WASHINGTON, D.C.—Ahead of Trump's planned July 4 military parade, several dozen Imperial walkers began to arrive in Washington throughout the week. The AT-ATs were dropped off by U.S. Space Force Star Destroyers just outside the city and then slowly marched toward the capital (rather than being dropped right next to their target, for some reason). Military bands solemnly played the Imperial March in honor of their arrival. Trump was seen at the White House, pointing excitedly at the looming all-terrain armored transports through an Oval Office window. "Wow, look at those guys!" he said while gleefully clapping his hands. "Do...