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Accompanied by members of the U.S. Navy SEALs, Carmella LaSpada (2nd R), White House Special Projects Aide to President John F. Kennedy, participates in a wreath laying ceremony at the Tomb of the Unknowns in honor of Kennedy at Arlington National Cemetery November 22, 2013 in Arlington, Virginia. Remembrance ceremonies were held across the United States today, the 50th anniversary of the assassination of President Kennedy. President Kennedy established the Navy SEALs in 1962 as a small, elite maritime military force to conduct unconventional warfare. (Photo by Chip Somodevilla/Getty Images) ( 451377953 )

Former US Green Beret soldiers salute at the gravesite of former US President John F. Kennedy at Arlington National Cemetery in Arlington, Virginia, on November 22, 2013, the 50th anniversary of his assassination. With flags fluttering at half-staff, the United States paused Friday to mourn President John F. Kennedy and a generation's broken dreams, cut down 50 years ago by an assassin's bullet. AFP PHOTO/Nicholas KAMM/AFP/Getty Images ( 524905943 )

A woman places flowers at the JFK Tribute on November 22, 2013 in Fort Worth, Texas. People visited the JFK Tribute on the 50th anniversary of the assassination of U.S. President John F. Kennedy when he was shot as he rode in a Presidential motorcade through Dealey Plaza in Dallas, Texas. (Photo by Tom Pennington/Getty Images) ( 451350077 )

A U.S. Navy sailer leaves a memento at the gravesite of former U.S. President John F. Kennedy at Arlington National Cemetery November 22, 2013 in Arlington, Virginia. Remembrance ceremonies will be held across the United States today, the 50th anniversary of the assassination of President Kennedy. (Photo by Chip Somodevilla/Getty Images) ( 451350283 )

Floral tributes are laid on the John F. Kennedy Memorial in Dallas, Texas, USA, 22 November 2013. 22 November marks the 50th anniversary of the 35th President of the United States John F. Kennedy's assassination on 22 November 1963, at Dealey Plaza in Dallas, Texas. Other commemorative events are planned around the country. EPA/LARRY W. SMITH ( USA JFK ASSASSINATION 50TH ANNIVERSARY )

The sign at the John F. Kennedy Memorial in Dallas, Texas, USA, 22 November 2013. 22 November marks the 50th anniversary of the 35th President of the United States John F. Kennedy's assassination on 22 November 1963, at Dealey Plaza in Dallas, Texas, USA. Other commemorative events are planned around the country. EPA/LARRY W. SMITH ( USA JFK ASSASSINATION 50TH ANNIVERSARY )

Former Speaker of the House, Congressman Jim Wright is honored at the Fort Worth Chamber of Commerce breakfast at the Hilton Hotel with the High Impact Legacy Award during an event on the 50th anniversary of the John F. Kennedy's assassination, Friday, Nov. 22, 2013. The 50th anniversary is being marked today in Dallas, where Kennedy was shot, and elsewhere in the United States and overseas. (AP Photo/The Fort Worth Star-Telegram, Joyce Marshall) ( Kennedy Anniversary )

A wreath honoring Dallas Police Officer J.D. Tippit is placed at the National Law Enforcement Officers Memorial November 22, 2013 in Washington, DC. Tippit was shot and killed by Lee Harvey Oswald when the police officer stopped to question Oswald following the assassination of U.S. President John F. Kennedy 50 years ago today. ( 451369799 )

Tatiana Schlossberg, granddaughter of former US President John F Kennedy attends a memorial service in Runnymede, Surrey on November 22, 2013, to mark the 50th anniversary of his assassination. AFP PHOTO / BEN STANSALL/AFP/Getty Images ( 524902375 )

People wearing rain ponchos gather at security before a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/Tony Gutierrez) ( JFK Anniversary )

Debbie Ford of McKinney, Texas goes through security before a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/Tony Gutierrez) ( JFK Memories of Kennedy )

A woman arranges flowers at the sign in tables in the John F. Kennedy Presidential Library and Museum before visitors arrive Friday Nov. 22, 2013 in Boston. Kennedy, the 35th President of the United States, was assassinated in Dallas 50 years ago today. (AP Photo/Stephan Savoia) ( JFK Anniversary )

A visitor bundled for the cold, waits for a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/Tony Gutierrez) ( JFK Anniversary )

Tatiana Schlossberg granddaughter of President J.F. Kennedy makes a short speech during a ceremony at the JFK memorial at Runnymede, England, Friday, Nov. 22, 2013. A short ceremony took place at the JFK memorial which overlooks the site of the signing go the Magna Carta in 1215. Friday is the 50th anniversary of the assassination of President John F. Kennedy in Dallas. (AP Photo/Alastair Grant) ( Britain JFK Anniversary )

Flags are lowered to half staff to honor the 35th President of the United States, John F. Kennedy, who was killed fifty years ago today, on November 22, 2013, in Washington, DC. President Obama ordered flags to be flown at half staff on the 50th anniversary of President Kennedy's assassination during his visit to Dallas, Texas, in 1963. (Photo by Mark Wilson/Getty Images) ( 451341325 )

Ambassador Jean Kennedy Smith (C), sister of slain U.S. President John F. Kennedy, visits her brother's grave with members of her family during a wreath-laying ceremony at the at Arlington National Cemetery November 22, 2013 in Arlington, Virginia. (Photo by Chip Somodevilla/Getty Images) ( 451341813 )

A view of the JFK Tribute on November 22, 2013 in Fort Worth, Texas. People visited the JFK Tribute on the 50th anniversary of the assassination of U.S. President John F. Kennedy when he was shot as he rode in a Presidential motorcade through Dealey Plaza in Dallas, Texas. (Photo by Tom Pennington/Getty Images) ( 451350093 )

People visit the gravesite of former U.S. President John F. Kennedy at Arlington National Cemetery November 22, 2013 in Arlington, Virginia. Remembrance ceremonies will be held across the United States today, the 50th anniversary of the assassination of President Kennedy. (Photo by Chip Somodevilla/Getty Images) ( 451350279 )

Herman Whalen Jr. of Syracuse, New York, kneels at the gravesite of former U.S. President John F. Kennedy, his wife Jaqueline Kennedy and other family members at Arlington National Cemetery November 22, 2013 in Arlington, Virginia. When he was a boy in 1963, Whalen and his family laid a wreath at the gravesite. Remembrance ceremonies will be held across the United States today, the 50th anniversary of the assassination of President Kennedy. (Photo by Chip Somodevilla/Getty Images) ( 451369687 )

The Eternal Flame burns at the gravesite of former U.S. President John F. Kennedy at Arlington National Cemetery November 22, 2013 in Arlington, Virginia. Remembrance ceremonies will be held across the United States today, the 50th anniversary of the assassination of President Kennedy. (Photo by Chip Somodevilla/Getty Images) ( 451369691 )

Dallas Police Officer J.D. Tippit's name is shown carved into the National Law Enforcement Officers Memorial November 22, 2013 in Washington, DC. Tippit was shot and killed by Lee Harvey Oswald when the police officer stopped to question Oswald following the assassination of U.S. President John F. Kennedy 50 years ago today. (Photo by Win McNamee/Getty Images) ( 451369793 )

People tour an exhibit at the Newseum dedicated to John F. Kennedy who was killed fifty years ago today, on November 22, 2013, in Washington, DC. Today is the 50th anniversary of President Kennedy's assassination during his visit to Dallas, Texas, in 1963. (Photo by Mark Wilson/Getty Images) ( 451377027 )

People tour an exhibit at the Newseum dedicated to John F. Kennedy who was killed fifty years ago today, on November 22, 2013, in Washington, DC. Today is the 50th anniversary of President Kennedy's assassination during his visit to Dallas, Texas, in 1963. (Photo by Mark Wilson/Getty Images) ( 451377311 )

Accompanied by members of the U.S. Navy SEALs, Carmella LaSpada (C), White House Special Projects Aide to President John F. Kennedy, participates in a wreath laying ceremony at the Tomb of the Unknowns in honor of Kennedy at Arlington National Cemetery November 22, 2013 in Arlington, Virginia. Remembrance ceremonies were held arcoss the United States today, the 50th anniversary of the assisination of President Kennedy. President Kennedy established the Navy SEALs in 1962 as a small, elite maritime military force to conduct unconventional warfare. (Photo by Chip Somodevilla/Getty Images) ( 451377947 )

Accompanied by members of the U.S. Navy SEALs, Carmella LaSpada (C), White House Special Projects Aide to President John F. Kennedy, participates in a wreath laying ceremony at the Tomb of the Unknowns in honor of Kennedy at Arlington National Cemetery November 22, 2013 in Arlington, Virginia. (Photo by Chip Somodevilla/Getty Images) ( 451377955 )

A crowd gathers on the grassy knoll before a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/Tony Gutierrez) ( JFK Anniversary )

Sean MacLean of Calgary, Alberta, Canada, left, and Colleen Bonner of Hurst, Texas display yellow wrist bands for access before ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/Tony Gutierrez) ( JFK Anniversary )

A crowd wearing rain ponchos and bundled for the cold, gathers before a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/Tony Gutierrez) ( JFK Anniversary )

Children gather around a a multimedia display "John F. Kennedy His Life and Legacy" in the grand foyer at the John F. Kennedy Center for the Performing Arts in Washington, Friday, Nov. 22, 2013, on the 50th anniversary of President John F. Kennedy's death. (AP Photo/Carolyn Kaster) ( JFK Anniversary )

A crowd gathers before a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/Benny Snyder) ( JFK Anniversary )

The window, center with box, at the Texas School Book Depository building where Lee Harvey Oswald stood to shoot at John F. Kennedy is seen before a ceremony to mark the 50th anniversary of Kennedy's assassination, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/Tony Gutierrez) ( JFK Anniversary )

A crowd moves into position before a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/Tony Gutierrez) ( JFK Anniversary )

Chato Prado, 39, from Chicago pauses for a photo in front of the Texas School book Depository building before a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/Tony Gutierrez) ( JFK Anniversary Running )

Lillian Lawson, 80 enters through security before a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. (AP Photo/Tony Gutierrez) ( JFK Anniversary )

Images of the Kennedy's are displayed before a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/Benny Snyder) ( JFK Anniversary )

Brenda Murphy of Fort Worth pauses at the JFK Tribute outside the Hilton Hotel on the 50th anniversary of the John F. Kennedy's assassination, Friday, Nov. 22, 2013. The 50th anniversary is being marked today in Dallas, where Kennedy was shot, and elsewhere in the United States and overseas. (AP Photo/The Fort Worth Star-Telegram, Joyce Marshall) ( JFK Anniversary )

US ambassador Matthew Barzun lays a wreath during a memorial service for former US President John F Kennedy in Runnymede, Surrey on November 22, 2013, to mark the 50th anniversary of his assassination. AFP PHOTO / BEN STANSALL/AFP/Getty Images ( 524902531 )

An attendee holds an order of service at a memorial for former US President John F Kennedy in Runnymede, Surrey on November 22, 2013, to mark the 50th anniversary of his assassination. AFP PHOTO / BEN STANSALL/AFP/Getty Images ( 524902548 )

A crowd gathers before a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/Benny Snyder) ( JFK Anniversary )

Clint Hill, a member of the late First Lady Jacqueline Kennedy's secret service detail, is the keynote speaker at the Hilton Hotel during the Fort Worth Chamber of Commerce breakfast on the 50th anniversary of the John F. Kennedy's assassination, Friday, Nov. 22, 2013. The 50th anniversary is being marked today in Dallas, where Kennedy was shot, and elsewhere in the United States and overseas. (AP Photo/The Fort Worth Star-Telegram, Joyce Marshall) ( JFK Anniversary )

Clint Hill, who served on Jacqueline Kennedy's Secret Service detail, Fort Worth Mayor Betsy Price and Congressman Roger Williams place a wreath outside the Hilton hotel in Fort Worth, Texas, at a tribue to President John F. Kennedy on Friday, Nov. 22, 2013, marking the 50th anniversary of his death. (Joyce Marshall/Fort Worth Star-Telegram/MCT) ( US NEWS JFK-50YEARS 3 FT )

US Attorney General Eric Holder pays his respects at the grave of John F. Kennedy at Arlington National Cemetery on November 22, 2013, on the 50th anniversary of Kennedy's death. Holder has been visiting the grave since his youth, and would visit there with his mother before she passed away. AFP PHOTO/POOL/Jacquelyn MARTIN/AFP/Getty Images ( 524902761 )

The sun rises over Arlington National Cemetery on the 50th anniversary of the death of President John F. Kennedy, Friday, Nov. 22, 2013. (AP Photo/Jacquelyn Martin) ( JFK Anniversary )

A Dallas police officer watches the event from a building behind the stage in Dallas, Texas, USA, 22 November 2013. This day marks the 50th anniversary of the 35th President of the United States John F. Kennedy's assassination on 22 November 1963 at Dealey Plaza in Dallas, Texas, USA. Lee Harvey Oswald was accused of the shooting and was later killed on 24 November 1963 by a gunshot by Jack Ruby. EPA/LARRY W. SMITH ( USA 50th ANNIVERSARY OF ASSASSINATION JOHN F KENNEDY )

Dallas Mayor Mike Rawlings speaks to the crowd in Dallas, Texas, USA, 22 November 2013. This day marks the 50th anniversary of the 35th President of the United States John F. Kennedy's assassination on 22 November 1963 at Dealey Plaza in Dallas, Texas, USA. Lee Harvey Oswald was accused of the shooting and was later killed on 24 November 1963 by a gunshot by Jack Ruby. EPA/LARRY W. SMITH ( USA 50th ANNIVERSARY OF ASSASSINATION JOHN F KENNEDY )

A crowd is gathered at Dealey Plaza during a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/The Dallas Morning News, Tom Fox) ( JFK Anniversary )

James Taylor sings his song "Shower the People" with the U.S. Naval Academy Women's Glee Club during a ceremony to commemorate the 50th anniversary of the assassination of President John F. Kennedy at the John F. Kennedy Library and Museum in Boston. Kennedy, the 35th President of the United States, was assassinated in Dallas 50 years ago today. (AP Photo/Stephan Savoia) ( JFK Anniversary )

Dallas Mayor Mike Rawlings observes a moment of silence during the ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/The Dallas Morning News, G.J. McCarthy) ( JFK Anniversary )

Massachusetts Gov. Deval Patrick calls for a moment of silence at 1:58 PM EST to mark the time of death for President Kennedy during a ceremony to commemorate the 50th anniversary of Kennedy's assassination at the John F. Kennedy Library and Museum in Boston, on Friday, Nov. 22, 2013. Kennedy, the 35th President of the United State, was assassinated in Dallas, Texas 50 years ago today. (AP Photo/Stephan Savoia) ( JFK Anniversary )

People visit the John F. Kennedy Memorial Plaza on November 22, 2013 in Dallas, Texas. Visitors streamed through the memorial on the 50th anniversary of the assassination of U.S. President John F. Kennedy as he rode in a Presidential motorcade in Dealey Plaza. (Photo by Tom Pennington/Getty Images) ( 451412869 )

Author and historian David McCullough delivers his remarks during the ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/The Dallas Morning News, Tom Fox) ( JFK Anniversary )

Members of the Dallas Police Department Honorary Color Guard stand at attention during a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/LM Otero) ( JFK Anniversary )

The United States Naval Academy Glee Club performs during a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/Tony Gutierrez) ( JFK Anniversary )

Crews raise a large banner on Main Street before the start of a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/The Dallas Morning News, G.J. McCarthy) ( JFK Anniversary )

Members of the audience pause for the final prayer during a ceremony to mark the 50th anniversary of the assassination of John F. Kennedy, Friday, Nov. 22, 2013, at Dealey Plaza in Dallas. President Kennedy's motorcade was passing through Dealey Plaza when shots rang out on Nov. 22, 1963. (AP Photo/LM Otero) ( APTOPIX JFK Anniversary )