FILE- In this June 1970 file photo, taken by Associated Press photographer Huynh Cong "Nick" Ut, south Vietnamese Marines rush to the point where descending U.S. Army helicopter will pick them up after a sweep east of the Cambodian town of Prey-Veng during the Vietnam War. It only took a second for Associated Press Photographer Huynh Cong "Nick" Ut to snap the iconic black-and-white image of Phan Thi Kim Phuc after a napalm attack in 1972, but it communicated the horrors of the Vietnam War in a way words could never describe, helping to end one of America's darkest eras. The war people in the United States simply call Vietnam and the Vietnamese refer to as their Resistance War Against America has been over for 40-plus years, yet it lingers in so many ways. That was apparent this week when Defense Secretary Jim Mattis dropped in for a couple of days of defense diplomacy with a former enemy. (AP Photo/Nick Ut, File)