Brian Hook, U.S. special representative for Iran, walks past fragments of Iranian short range ballistic missiles (Qiam) at the Iranian Materiel Display (IMD) at Joint Base Anacostia-Bolling, in Washington, Thursday Nov. 29, 2018. The Trump administration accused Iran of stepping up violations of a U.N. ban on arms exports by sending rockets and other weaponry to rebels in Afghanistan and Yemen. The presentation displays weapons and fragments of weapons seized in Afghanistan, Bahrain and Yemen that it said are evidence Iran is a "grave and escalating threat" that must be stopped. (AP Photo/Carolyn Kaster)