DAYTON, Ohio — DAYTON, Ohio (AP) — U.S. military leaders are among thousands who have joined in a tribute to World War II's Doolittle Raiders, the World War II airmen whose daring bombing attack on Japan helped boost American morale.

A flyover by five B-25 bombers helped cap a Saturday memorial service in which a wreath was placed at the Doolittle Raider monument outside the National Museum of the U.S. Air Force near Dayton in southwest Ohio.

Three of the four surviving Raiders plan a final ceremonial toast to fallen comrades Saturday evening. The fourth couldn't travel because of health issues.

Commander James "Jimmy" Doolittle commanded the daring mission credited with throwing the Japanese off balance after a string of military successes.

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  • World War II Marine's Diary

    This photo provided by the National WWII Museum shows a photo of 22-year-old Marine Cpl. Thomas “Cotton” Jones, who died in the bloody assault on a Japanese-held island during World War II. Before Jones died, he wrote what he called his “last life request” to anyone who might find his diary: Please give it to Laura Mae Davis, the girl he loved. Laura Mae Davis Burlingame _ she married an Army Air Corps man in 1945 _ had given the diary to Jones, and didn’t know it had survived him until visiting the museum on April 24. (AP Photo/National WWII Museum)

  • Laura Mae Davis Burlingame

    In this Thursday, May 23, 2013 photo, Laura Mae Davis Burlingame, 90, holds a photo of herself from high school, in her Moorseville, Ind. home. The photo filled the back cover of a diary she had given to a Marine Cpl. Thomas “Cotton” Jones, a 22-year-old machine gunner, who died in the bloody assault on a Japanese-held island during World War II. Burlingame didn’t know the military diary she gave Jones had survived him. She saw it and read, “If this Diary is lost and if it is Possible please return it to Miss Laura Mae Davis. Address. Winslow Indiana.” (AP Photo/Michael Conroy)

  • World War II Marine's Diary

    This photo provided by the National WWII Museum shows a page of photographs from the diary by 22-year-old Marine Cpl. Thomas “Cotton” Jones, who died in the bloody assault on a Japanese-held island during World War II. The diary includes his writings as well as photos of himself and his high school sweetheart, Laura Mae Davis. Before Jones died, he wrote what he called his “last life request” to anyone who might find his diary: Please give it to Laura Mae Davis, the girl he loved. Laura Mae Davis Burlingame _ she married an Army Air Corps man in 1945 _ had given the diary to Jones, and didn’t know it had survived him until visiting the museum on April 24. (AP Photo/National WWII Museum)

  • World War II Marine's Diary

    In this May 23, 2013 photo, a diary, letters and photos of 22-year-old Marine Cpl. Thomas "Cotton" Jones, who died in the bloody assault on a Japanese-held island during World War II, are on display at the National WWII Museum in New Orleans. Before Jones died, he wrote what he called his “last life request” to anyone who might find his diary: Please give it to Laura Mae Davis, the girl he loved. Laura Mae Davis Burlingame _ she married an Army Air Corps man in 1945 _ had given the diary to Jones, and didn’t know it had survived him until visiting the museum on April 24. (AP Photo/Gerald Herbert)

  • World War II Marine's Diary

    In this Thursday, May 23, 2013 photo, Laura Mae Davis Burlingame, 90, displays a copy of the first pages of the diary of Marine Cpl. Thomas “Cotton” Jones, at her Moorseville, Ind. home. Burlingame had given the diary to Jones, a 22-year-old machine gunner, who died in the bloody assault on a Japanese-held island. Burlingame didn’t know the military diary she gave Jones had survived him. She saw it and read, “If this Diary is lost and if it is Possible please return it to Miss Laura Mae Davis. Address. Winslow Indiana.” (AP Photo/Michael Conroy)

  • World War II Marine's Diary

    In this May 23, 2013 photo, a page of out of the diary of 22-year-old Marine Cpl. Thomas Jones featuring a photo of his high school sweetheart, Laura Mae Davis Burlingame, is on display at the National WWII Museum in New Orleans. Behind is a Marine uniform like one Jones, who died in the bloody assault on a Japanese-held island during World War II, would have worn. Before Jones died, he wrote what he called his “last life request” to anyone who might find his diary: Please give it to Laura Mae Davis, the girl he loved. Laura Mae Davis Burlingame _ she married an Army Air Corps man in 1945 _ had given the diary to Jones, and didn’t know it had survived him until visiting the museum on April 24. (AP Photo/Gerald Herbert)

  • World War II Marine's Diary

    In this May 23, 2013 photo, a page of out of the diary of 22-year-old Marine Cpl. Thomas Jones featuring a photo of his high school sweetheart, Laura Mae Davis Burlingame, is on display at the National WWII Museum in New Orleans. Behind is a Marine uniform like one Jones, who died in the bloody assault on a Japanese-held island during World War II, would have worn. Before Jones died, he wrote what he called his “last life request” to anyone who might find his diary: Please give it to Laura Mae Davis, the girl he loved. Laura Mae Davis Burlingame _ she married an Army Air Corps man in 1945 _ had given the diary to Jones, and didn’t know it had survived him until visiting the museum on April 24. (AP Photo/Gerald Herbert)

  • World War II Marine's Diary

    This photo provided by the National WWII Museum shows pages from the diary by 22-year-old Marine Cpl. Thomas “Cotton” Jones, who died in the bloody assault on a Japanese-held island during World War II. Before Jones died, he wrote what he called his “last life request” to anyone who might find his diary: Please give it to Laura Mae Davis, the girl he loved. Laura Mae Davis Burlingame _ she married an Army Air Corps man in 1945 _ had given the diary to Jones, and didn’t know it had survived him until visiting the museum on April 24. (AP Photo/National WWII Museum)

  • World War II Marine's Diary

    This photo provided by the National WWII Museum shows the first entry from the diary of 22-year-old Marine Cpl. Thomas “Cotton” Jones, who died in the bloody assault on a Japanese-held island during World War II. Before Jones died, he wrote what he called his “last life request” to anyone who might find his diary: Please give it to Laura Mae Davis, the girl he loved. Laura Mae Davis Burlingame _ she married an Army Air Corps man in 1945 _ had given the diary to Jones, and didn’t know it had survived him until visiting the museum on April 24. (AP Photo/National WWII Museum)

  • World War II Marine's Diary

    This photo provided by the National WWII Museum shows pages from the diary by 22-year-old Marine Cpl. Thomas “Cotton” Jones, who died in the bloody assault on a Japanese-held island during World War II. Before Jones died, he wrote what he called his “last life request” to anyone who might find his diary: Please give it to Laura Mae Davis, the girl he loved. Laura Mae Davis Burlingame _ she married an Army Air Corps man in 1945 _ had given the diary to Jones, and didn’t know it had survived him until visiting the museum on April 24. (AP Photo/National WWII Museum)

  • World War II Marine's Diary

    This photo provided by the National WWII Museum shows pages from the diary by 22-year-old Marine Cpl. Thomas “Cotton” Jones, who died in the bloody assault on a Japanese-held island during World War II. Before Jones died, he wrote what he called his “last life request” to anyone who might find his diary: Please give it to Laura Mae Davis, the girl he loved. Laura Mae Davis Burlingame _ she married an Army Air Corps man in 1945 _ had given the diary to Jones, and didn’t know it had survived him until visiting the museum on April 24. (AP Photo/National WWII Museum)

  • World War II Marine's Diary

    In this May 23, 2013 photo, a diary, letters and photos of 22-year-old Marine Cpl. Thomas "Cotton" Jones, who died in the bloody assault on a Japanese-held island during World War II, are on display at the National WWII Museum in New Orleans. Before Jones died, he wrote what he called his “last life request” to anyone who might find his diary: Please give it to Laura Mae Davis, the girl he loved. Laura Mae Davis Burlingame _ she married an Army Air Corps man in 1945 _ had given the diary to Jones, and didn’t know it had survived him until visiting the museum on April 24. (AP Photo/Gerald Herbert)

  • World War II Marine's Diary

    This photo provided by the National WWII Museum shows pages from the diary by 22-year-old Marine Cpl. Thomas “Cotton” Jones, who died in the bloody assault on a Japanese-held island during World War II. Before Jones died, he wrote what he called his “last life request” to anyone who might find his diary: Please give it to Laura Mae Davis, the girl he loved. Laura Mae Davis Burlingame _ she married an Army Air Corps man in 1945 _ had given the diary to Jones, and didn’t know it had survived him until visiting the museum on April 24. (AP Photo/National WWII Museum)

  • World War II Marine's Diary

    This photo provided by the National WWII Museum shows a telegram notifying his parents of the death of their son, 22-year-old Marine Cpl. Thomas “Cotton” Jones, who died in the bloody assault on a Japanese-held island during World War II. (AP Photo/National WWII Museum)

  • World War II Marine's Diary

    This photo provided by the National WWII Museum shows pages from the diary by 22-year-old Marine Cpl. Thomas “Cotton” Jones, who died in the bloody assault on a Japanese-held island during World War II, including a portrait of his high school sweetheart, Laura Mae Davis, at right. Before Jones died, he wrote what he called his “last life request” to anyone who might find his diary: Please give it to Laura Mae Davis, the girl he loved. Laura Mae Davis Burlingame _ she married an Army Air Corps man in 1945 _ had given the diary to Jones, and didn’t know it had survived him until visiting the museum on April 24. . (AP Photo/National WWII Museum)

  • World War II Marine's Diary

    This photo provided by the National WWII Museum shows pages from the diary by 22-year-old Marine Cpl. Thomas “Cotton” Jones, who died in the bloody assault on a Japanese-held island during World War II. Before Jones died, he wrote what he called his “last life request” to anyone who might find his diary: Please give it to Laura Mae Davis, the girl he loved. Laura Mae Davis Burlingame _ she married an Army Air Corps man in 1945 _ had given the diary to Jones, and didn’t know it had survived him until visiting the museum on April 24. (AP Photo/National WWII Museum)