A missile guidance system circuit board bearing the SHIG logo of Iranian arms manufacturer Shahid Hemmat Industries Group, which the U.S. Defense Department says proves the weapon was manufactured in Iran before the Pentagon says it was fired by Houthi rebels from Yemen into Saudi Arabia in July 2016, is seen under a magnifying glass as it sits on display at a military base in Washington, U.S., December 13, 2017. Picture taken December 13, 2017. REUTERS/Jim Bourg