National Security Adviser Robert O’Brien announced that the U.S. Navy was in the process of arming its destroyers and submarines with hypersonic missiles in a bid to stave off the “China threat,” reported South China Morning Post today. More than 60 destroyers will be outfitted with the weapons that are capable of travelling at more than five times the speed of sound, a report on the program says, reported SCMP, referring to O’Brien’s Oct. 21 trip to Portsmouth Naval Shipyard in Maine.