The U.S. Army is testing the Iron Dome on Guam. WSJ’s Shelby Holliday got a first-hand look at the missile-defense system, which arrived months after a top military leader called the island’s defenses inadequate against threats from China. Photo: Adam Falk/The Wall Street Journal More from the Wall Street Journal: Visit WSJ.com: http://www.wsj.com Visit the WSJ Video Center: https://wsj.com/video On Facebook: https://www.facebook.com/pg/wsj/videos/ On Twitter: https://twitter.com/WSJ On Snapchat: https://on.wsj.com/2ratjSM #IronDome #Guam #WSJ