17-ship B-25 Mass Arrival

Multiple photos taken within one minute were merged to form a virtual panorama of the 17 B-25 bombers that came from across the nation to the National Museum of the U.S. Air Force at Wright-Patterson Air Force Base, OH on April 17, 2010. The Mitchell bombers will participate in a formation flyover during the Doolittle Raiders' 68th reunion. (U.S. Air Force photo illustration/Lance Cheung)

Doolittle Raiders Memorial Service

Lt. Col. Richard Cole was applauded after speaking at the memorial service during the Doolittle Raiders Reunion, hosted by the National Museum of the U.S. Air Force at Wright-Patterson Air Force Base, Ohio on April 18, 2010. (U.S. Air Force photo/Lance Cheung)

68th Reunion of Doolittle Raiders

Doolittle Raider Goblets on display at the National Museum of the U.S. Air Force at Wright-Patterson Air Force Base, Ohio on April 18, 2010. Air Force Academy cadets were on hand to answer questions about the goblets. Behind the display, Doolittle Raiders signed autographs and met with thousands of visitos during the three-day event. (U.S. Air Force photo/Lance Cheung)

68th Reunion of Doolittle Raiders

Doolittle Raiders drew thousands of visitors to their autograph sessions at the National Museum of the U.S. Air Force at Wright-Patterson Air Force Base, Ohio on April 18, 2010. To ensure people were easily able to meet all the Raiders, groups (standing at tables) were brought in one a time to give people an easier time to meet all the Raiders. The main body of fans was waiting out of sight in lines that extended through corridors and down adjacent galleries the size of this Modern Era hanger. People waited in an orderly line for hours with books, posters, photos, and model airplanes that they asked the Doolittle Raiders to sign. (U.S. Air Force photo/Lance Cheung)

B-25 Mitchells fly again

B-25 Mitchell bombers fly above the National Museum of the U.S. Air Force at Wright-Patterson Air Force Base, Ohio, April 18, 2010. The flight commemorated Lt. Col. Jimmy Doolittle's squad of 16 B-25s that bombed targets in Japan as a response to the attack on Pearl Harbor. (U.S. Air Force photo/Tech. Sgt. Jacob N. Bailey)

B-25 Mitchells fly again

Three B-25 Mitchell bombers fly over the National Museum of the U.S. Air Force at Wright-Patterson Air Force Base, Ohio, April 18, 2010, commemorating the anniversary of the Doolittle Raid over Tokyo of April 18, 1942. (U.S. Air Force photo/Tech. Sgt. Jacob N. Bailey)