Secretary Gates talks with guest of honor Frank Buckles. Secretary of Defense Robert M. Gates (left) talks with guest of honor 107 year-old Frank Buckles during Pentagon ceremonies unveiling an exhibit of portraits by photographer David DeJonge, of the last nine veterans of WWI on March 6, 2008. Buckles served as an ambulance driver in WWI after enlisting at age 15. The only other surviving WWI vet, John Babcock, was unable to attend the ceremony. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 579379-H-LMM25-005.jpg Photo Gallery