A、He drove an ambulance for a hospital. B、He served as the Honorary Chairman. C、He worked in a shipping company. D、He served in

The last known American veteran of World War I died Sunday at his home in West Virginia. Former US Army Corporal Frank Buckles was 110 years old. Buckles wanted to serve when World War I broke out.(16)He exaggerated his age, twice, in order to join the Army in 1917, when he was just 15 years old, and his lie to the recruiter made it possible. Shortly afterward, at the age of 16, he was deployed to Europe as an ambulance driver. He saw the horror of war close up, ferrying the wounded from the trenches to primitive field hospitals. Later, he drove German prisoners back to Germany.(17)Buckles left the army in 1920 and years later, he went to work for a shipping company in the Philippines. When World War II broke out, he and other Americans there were put in prison camps where he had stayed for more than three years. The cup he ate out of for all that time is in the background of his 2008 portrait, which now hangs with eight others along one of the Pentagon’s many corridors. In a statement issued Monday,(18)the President praised Buckles, saying he continued to serve America until his death, as the Honorary Chairman of the World War I Memorial Foundation. The President said he joined the Buckles family "in celebrating a remarkable life that reminds us of the true meaning of patriotism and our obligations to each other as Americans. " In one sense, Frank Buckles was not much different from millions of other World War I veterans. With his enthusiasm and his longevity, however, it certainly was possible to say about him what he said on a ceremony, "Really, it was remarkable. I enjoyed every minute of it here. "
16. What did Corporal Frank Buckles do to join the army when he was 15 years old?
17. What did Buckles do years later after the World War I?
18. Why did the President praise Buckles?