Contamination Site Defense Secretary James N. Mattis meets with Vietnamese officials next to a dioxin-contaminated site at Bien Hoa Air Base outside Ho Chi Minh City, Vietnam, Oct. 17, 2018. SHARE: Download: Full Size (3.7 MB) Tags: Defense Secretary, mattis Credit: Lisa Ferdinando VIRIN: 181017-D-BN624-0194C.JPG Photo Gallery