Military vehicles carry DF-10 ship launched cruise missiles, drive past the Tiananmen Gate on September 3, 2015 in Beijing, China. (Andy Wong - Pool /Getty Images)
The U.S. Army and South Korean military responded to North Korea's missile launch with a combined ballistic missile exercise on July 5, 2017, into South Korean waters. (Photo by South Korean Defense Ministry/Getty Images)
U.S. President Donald Trump speaks during a Missile Defense Review announcement on January 17, 2019 at the Pentagon, in Arlington, Virginia. (Martin H. Simon/Getty Images)