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Two of the four surviving members of the 1942 raid on Tokyo led by Lt. Col. Jimmy Doolittle, Edward Saylor, center, and Richard Cole, right, are thanked by Gen. Mark Welsh III, Chief of Staff of the US Air Force, and Eric Fanning, left, acting Secretary of the US Air Force, Saturday, Nov. 9, 2013, at a monument marking the raid at the National Museum of the US Air Force in Dayton, Ohio. (AP Photo/Al Behrman) ( Doolittle Raiders Final Toast )

Richard Cole, left, one of the four surviving members of the 1942 raid on Tokyo led by Lt. Col. Jimmy Doolittle, speaks for the other survivors during ceremonies honoring them, Saturday, Nov. 9, 2013, at the National Museum of the US Air Force in Dayton, Ohio. (AP Photo/Al Behrman) ( Doolittle Raiders Final Toast )

Eric Fanning, left, acting Secretary of the US Air Force walks to the podium past three of the surviving members, seated left to right, Edward Saylor, David Thatcher, and Richard Cole, of the 1942 raid on Tokyo led by Lt. Col. Jimmy Doolittle, Saturday, Nov. 9, 2013, outside the National Museum of the US Air Force in Dayton, Ohio. The fourth surviving member, Robert Hite, was unable to travel to the ceremonies. (AP Photo/Al Behrman) ( Doolittle Raiders Final Toast )

David Thatcher, one of the four surviving members of the 1942 raid on Tokyo led by Lt. Col. Jimmy Doolittle, waves from a car as he arrives at the National Museum of the US Air Force, Saturday, Nov. 9, 2013, in Dayton, Ohio. Three of the four surviving members of the WWII raid came for a final toast in the evening. (AP Photo/Al Behrman) ( Doolittle Raiders Final Toast )

FILE - In this April 18, 2012 file photo, three surviving members of the Doolittle Raiders, front row from left: David J. Thatcher, Richard E. Cole and Edward J. Saylor, join historian Carroll V. Glines, far right, in watching a flyover of B-25 bombers at the National Museum of the United States Air Force in Dayton, Ohio commemorating the 70th anniversary of the Doolittle raid on Tokyo Wednesday, April 18, 2012. Thousands of visitors streamed to the national Air Force museum on Saturday, Nov. 9, 2013 to pay a Veterans Day weekend tribute to the few surviving members of the Doolittle Raiders, airmen whose daring raid on Japan helped boost American morale during World War II, as they planned to make their ceremonial final toast together. Only four of the 80 Raiders are still living, and one was unable to attend because of health issues. (AP Photo/Mark Duncan) ( Doolittle Raiders Final Toast Photo Gallery )

FILE-In this April 18, 2012 file photo shows silver cups with the names of the Doolittle Raiders sitting in a case with a bottle of cognac at the National Museum of the United States Air Force in Dayton, Ohio. Thousands of visitors streamed to the national Air Force museum on Saturday, Nov. 9, 2013 to pay a Veterans Day weekend tribute to the few surviving members of the Doolittle Raiders, airmen whose daring raid on Japan helped boost American morale during World War II, as they planned to make their ceremonial final toast together. Only four of the 80 Raiders are still living, and one was unable to attend because of health issues. (AP Photo/Mark Duncan, File) ( Doolittle Raiders Final Toast Photo Gallery )

FILE - In this Sept. 4, 1945 file photo, three of the fliers who raided Tokyo with Gen. James Doolittle in April,1942, are photographed in Washington, D.C. From left, Sgt. J.D. De Shazer, Salem, Ore, 1st Lt. Robert Hite, Earth, Tex., and 1st LT. C.J. Hielson, Hyrum, Utah. The three fliers left Karachi Sept.1 after being rescued from a Japanese prison. Thousands of visitors streamed to the national Air Force museum on Saturday, Nov. 9, 2013 to pay a Veterans Day weekend tribute to the few surviving members of the Doolittle Raiders, airmen whose daring raid on Japan helped boost American morale during World War II, as they planned to make their ceremonial final toast together. Only four of the 80 Raiders are still living, and one was unable to attend because of health issues. (AP Photo) ( Doolittle Raiders Final Toast Photo Gallery )

FILE - This April 17, 1975 file photo shows Gen. James H. Doolittle in Coral Gables, Fla. Thousands of visitors streamed to the national Air Force museum on Saturday, Nov. 9, 2013 to pay a Veterans Day weekend tribute to the few surviving members of the Doolittle Raiders, airmen whose daring raid on Japan helped boost American morale during World War II, as they planned to make their ceremonial final toast together. Only four of the 80 Raiders are still living, and one was unable to attend because of health issues. (AP Photo, file) ( Doolittle Raiders Final Toast Photo Gallery )

FILE - In this April 17, 1987 file photo, thirty members of Jimmy Doolittle’s Tokyo Raiders pose for a group picture in front of a B-25J bomber in Torrance, Calif., as they gather for a reunion. Thousands of visitors streamed to the national Air Force museum on Saturday, Nov. 9, 2013 to pay a Veterans Day weekend tribute to the few surviving members of the Doolittle Raiders, airmen whose daring raid on Japan helped boost American morale during World War II, as they planned to make their ceremonial final toast together. Only four of the 80 Raiders are still living, and one was unable to attend because of health issues. (AP Photo/Douglas C. Pizac) ( Doolittle Raiders Final Toast Photo Gallery )

FILE - In this April 17, 1948 file photo, army fliers greet James Doolittle, at a raider reunion in Minneapolis. Attending are, from left, Lt. Fred Braemer, Seattle, Wash., Capt. George Barr, Ashland, Wis., Gen. Doolittle; Maj. Howard Sessler, Los Angeles and Sgt. R. C. Bougeois, New Orleans, La. Thousands of visitors streamed to the national Air Force museum on Saturday, Nov. 9, 2013 to pay a Veterans Day weekend tribute to the few surviving members of the Doolittle Raiders, airmen whose daring raid on Japan helped boost American morale during World War II, as they planned to make their ceremonial final toast together. Only four of the 80 Raiders are still living, and one was unable to attend because of health issues.(AP Photo) ( Doolittle Raiders Final Toast Photo Gallery )

FILE - In this April 19, 1963 file photo, Gen. Jimmy Doolittle, right center, stands in a moment of silent prayer with Brig. Gen. John A. Hilger after laying a wreath at a Seattle memorial for World War II dead. Doolittle, who led the war’s first bombing raid on Tokyo 21 years ago, arrived in Seattle to join 25 of his raiders, standing in salute during the ceremony, for their 21st annual reunion. Thousands of visitors streamed to the national Air Force museum on Saturday, Nov. 9, 2013 to pay a Veterans Day weekend tribute to the few surviving members of the Doolittle Raiders, airmen whose daring raid on Japan helped boost American morale during World War II, as they planned to make their ceremonial final toast together. Only four of the 80 Raiders are still living, and one was unable to attend because of health issues. (AP Photo) ( Doolittle Raiders Final Toast Photo Gallery )

FILE - In this April 22, 1943 image provided by the U.S. Army Air Forces, Maj. Gen. James Doolittle's Tokyo raiders who finally ended their spectacular flight in China are grouped outside a shelter carved from a mountainside. Thousands of visitors streamed to the national Air Force museum on Saturday, Nov. 9, 2013 to pay a Veterans Day weekend tribute to the few surviving members of the Doolittle Raiders, airmen whose daring raid on Japan helped boost American morale during World War II, as they planned to make their ceremonial final toast together. Only four of the 80 Raiders are still living, and one was unable to attend because of health issues. (AP Photo/U.S. Army Air Forces) ( Doolittle Raiders Final Toast Photo Gallery )

FILE - In this July 14, 1943 file photo, Maj. Gen. James Doolittle, (third from left, front row) who led the air raid on Japan, April 18, 1942, and some of the men who flew with him drink a champagne toast from coffee cups during a reunion in North Africa on the first anniversary of the flight. Flyers are left to right front row: Maj. William Bower, Ravenna, OH; Maj. Travis Hoover, Arlington, Calif.; Maj. Gen. Doolittle Lt. Col. Harvey Hinman, San Francisco, (not one of raiders); Capt. Neston C. Daniel, Plaquemine, LA., Back row left to right: Capt. Howard A. Sessler of Arlington, Mass., who brought the picture to this country; Capt. William R. Pound, Jr., Kent Homes VA.; Maj. Rodney R. Wilder, Taylor, Tex.; Capt. James M. Arker, Livingston, Tex., Maj. Charles R. Greening, Tacoma, Wash., Maj. Joseph Klein, Paradise, Tex.; Capt. Griffith P. William, San. Diego, Calif., and Capt. Thomas C. Griffin, Chicago, Ill. (AP Photo) ( Doolittle Raiders Final Toast Photo Gallery )