In this Feb. 2, 2017 file photo, a mock North Korea’s Scud-B missile, center left, and South Korean missiles are displayed at Korea War Memorial Museum in Seoul, South Korea. North Korea on Monday, March 6, 2017, fired a projectile into the waters off its east coast, South Korea’s military said, in an apparent missile test that comes days after Washington and Seoul began huge military drills that Pyongyang insists are an invasion rehearsal.