Carter Signs Guestbook Following Defense Meetings Vietnamese naval officers stand in a row behind Defense Secretary Ash Carter as he signs the guestbook after meeting with Vice Minister of Defense and Commander of the People's Navy of Vietnam, Adm. Nguyen Van Hien in Vietnam, May 31, 2015. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 099487-K-EJP51-541.jpg Photo Gallery