Photographs recently released by the Australian government show that light anti-armor weapons seized from a smuggling vessel near Yemen’s coast appear to have been manufactured in Iran, further suggesting that Tehran has had a hand in a high-seas gunrunning operation to the Horn of Africa and the Arabian Peninsula. The weapons, a selection of at least nine rocket-propelled grenade launchers, were among thousands of weapons seized by an Australian warship, the Darwin, in February from an Iranian dhow that was sailing under the name Samer. The photographs of the weapons, a sample of the much larger quantity of arms, were...