Protesters shout slogans during a rally opposing the deployment the Terminal High-Altitude Area Defense system, or THAAD, at downtown Seoul, South Korea, Wednesday, March 8, 2017. U.S. missile launchers and other equipment needed to set up a controversial missile defense system arrived in South Korea, the U.S. and South Korean militaries said Tuesday, a day after North Korea test-fired four ballistic missiles into the ocean near Japan. The letters read “Oppose, THAAD.” (RSS/AP Photo/Lee Jin-man)