HANOI, VIETNAM - MAY 23: A Vietnamese woman walks past models of weapons at the Vietnam People's Air Force Museum on May 23, 2016 in Hanoi, Vietnam. U.S. President Barack Obama announced the U.S. is fully lifting its embargo on sales of lethal weapons to Vietnam during the first day of his historic visit four decades after the Vietnam war. (Photo by Linh Pham/Getty Images)
