Weapons administration

Visitors sit in front of the TV screen showing a news program reporting about North Korea's missile firing, at Seoul Train Station in Seoul, South Korea, Wednesday, April 5, 2017. North Korea fired a ballistic missile into its eastern waters Wednesday, U.S. and South Korean officials said, amid worries the North might conduct banned nuclear or rocket tests ahead of the first summit between President Donald Trump and his Chinese counterpart Xi Jinping this week. The letters read "North Korea fired a ballistic missile into its eastern waters." (AP Photo/Lee Jin-man)

British Ambassador to the United Nations Matthew Rycroft speaks to reporters outside the General Assembly at U.N. headquarters, Monday, March 27, 2017. Rycroft and other supporting countries were not participating in a meeting about prohibiting nuclear weapons, claiming that it was not the right time to do so in consideration of other countries that are trying to develop the weapons. (AP Photo/Seth Wenig)

British Ambassador to the United Nations Matthew Rycroft speaks to reporters outside the General Assembly at U.N. headquarters, Monday, March 27, 2017. Rycroft and other supporting countries were not participating in a meeting about prohibiting nuclear weapons, claiming that it was not the right time to do so in consideration of other countries that are trying to develop the weapons. (AP Photo/Seth Wenig)

In this photo provided by South Korean Defense Ministry, a U.S. Air Force B-1B bomber, right, and South Korean fighter jets conduct a joint training exercises over the Korean Peninsula Wednesday, March 22, 2017. North Korea's latest missile launch ended in failure on Wednesday as the United States sent a supersonic bomber streaking over ally South Korea in a show of force against the North, officials said. (South Korean Defense Ministry via AP)

Visitors walk by a TV screen showing a news program with a file footage of North Korean leader Kim Jong Un at the Seoul Train Station in Seoul, South Korea, Wednesday, March 22, 2017. North Korea's latest missile launch ended in failure on Wednesday, the U.S. and South Korean militaries said, three days after the North claimed a major breakthrough in its rocket development program. The Korean letters read: "Launch a missile." (AP Photo/Lee Jin-man)

Workers set up a fence around the PAC-3 Patriot missile unit deployed against North Korea's missile firing at the Defense Ministry in Tokyo, Wednesday, March 22, 2017. North Korea's latest missile launch Wednesday appears to have ended in a failure. That's what South Korean defense officials say, three days after the North claimed a major breakthrough in its rocket development program. (AP Photo/Shizuo Kambayashi)

Workers set up a fence around the PAC-3 Patriot missile unit deployed against North Korea's missile firing at the Defense Ministry in Tokyo, Wednesday, March 22, 2017. North Korea's latest missile launch Wednesday appears to have ended in a failure. That's what South Korean defense officials say, three days after the North claimed a major breakthrough in its rocket development program. (AP Photo/Shizuo Kambayashi)