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Kennedy wears his football uniform when he was at Dexter School, a private elementary school in Brookline, Mass., in 1927. Denver Post file ( img0278A )

Kennedy, standing third from left, was on the Harvard swim team in 1935. Keystone/Getty Images ( 96f/40/fott/5171/11 )

Kennedy strikes a pose at age 16, when he played football for the Choate School in Wallingford, Conn. Kennedy, who played with the "juniors" (boys not heavy enough for varsity), was described by a teammate as "a tiger on defense." He played left end and tackle. Denver Post file ( img0265A )

Kennedy swims in the backstroke event for the varsity swimming team at Harvard on March 10, 1938. Associated Press file ( John F Kennedy Harvard 1938 )

From left, Jack, Bobby and Ted Kennedy stand for a photo in Hyannisport, Mass., in 1946. Denver Post file ( img0074A )

Lt. Kennedy, pictured in the Solomon Islands, served on PT 109 in World War II. Denver Post file ( img0231A )

The future 35th president served as a U.S. Navy lieutenant and commander of a patrol torpedo (PT) boat during World War II. Kennedy is shown at the extreme right with members of his crew at a South Pacific naval base. National Archive/Newsmakers ( 38109154jfk2_20010628_18440.jpg )

Kennedy sits at the helm of a Navy PT boat in World War II. He later became a representative and senator for Massachusetts. Denver Post file ( img0283A )

The Kennedy family gathers for a photo in 1934. From left: Pat, Joe Jr., Bobby, Kathleen, Rose, Jack, Rosemary, Teddy, Joe Sr., Jean and Eurnice. Denver Post file ( img0107A )

Actor Peter Lawford and his wife, Pat, pose with Sen. Kennedy, who was godfather for the christening of their daughter, Victoria, in 1958. Denver Post file ( img0055A )

Kennedy relaxes with his dog, Mo, on June 22, 1946 at Hyannisport, Mass. Peter J. Carroll, Associated Press file ( John F Kennedy and Dog 1946 )

Sen. Kennedy and his fiancee, Jacqueline Bouvier, 23, meet at the net as they prepare for a game of tennis at the Kennedy residence at Hyannis, Mass., on June 27, 1953, where they were spending the weekend. Associated Press file ( John F. Kennedy and Jacqueline Bouvier )

Kennedy and Jacqueline stroll arm-in-arm in early 1953. Kennedy had won a U.S. Senate seat in 1952, and the couple were married in 1953. Denver Post file ( img0000949AA.JPG )

Jacqueline prepares for a candlelight meal in spring 1953. Denver Post file ( img0000949AA.JPG )

Sen. Kennedy, Democratic presidential nominee, talks to three of his nephews just before they boarded a plane in Los Angeles on July 17, 1960, on their way home to Massachusetts. From left are Bobby Shriver, son of Kennedyís sister, Mrs. R. Sargeant Shriver; and Bobby and Joe Kennedy, sons of the senator's brother, Robert Kennedy. Associated Press file ( Sen. John F. Kennedy )

Jacqueline Bouvier Kennedy as a young debutante in the late 1940s. ( img0001009AA.JPG )

An invitation to the Sept. 12, 1953, wedding of Jacqueline Lee Bouvier and Sen. John Fitzgerald Kennedy. John F. Kennedy Presidential Library and Museum

Sen. Kennedy leaves a Newport, R.I., church with his bride, the former Jacqueline Bouvier on Sept. 12, 1953. Associated Press file ( KENNEDY WEDDING DAY )

Jacqueline Bouvier Kennedy and Sen. John F. Kennedy celebrate during their wedding reception at Hammersmith Farm, Newport, R.I., on Sept. 12, 1953.

The newlywed Kennedys cut the cake at their wedding Sept. 12, 1953. Cecil Yates, Associated Press file ( PRESIDENTIAL LOVE LETTERS )

Sen. Kennedy and Jacqueline pose for wedding-day photos on Sept. 12, 1953, at Hammersmith Farm in Newport, R.i. The Toni Frissell Collection, Library of Congress ( PX 81-32:65 )

The formal wedding portrait of Jacqueline Bouvier Kennedy on Sept. 12, 1953. John F. Kennedy Presidential Library and Museum

The newlyweds sit in a convertible while on their honeymoon in Acapulco, Mexico, in September 1953.

The newlyweds admire a sailfish the senator caught during their honeymoon in Acapulco in September 1953. John F. Kennedy Presidential Library and Museum

Sen. Kennedy and Jacqueline relax aboard the family yacht, Marlin, before sailing around Nantucket sound at Hyannis Port, Mass., on July 19, 1960. ( JOHN JACQUELINE KENNEDY )

Kennedy sits with his son, John Jr., on the beach at Newport, R.I. on Sept. 12, 1963. National Archive/Newsmakers ( 37957023cent_20010629_37659.jpg )

Kennedy and friends enjoy an afternoon aboard the presidential yacht Honey Fitz off Hyannis Port in 1963. The group includes Lamar Billings; John Reed, Assistant Secretary of Treasury; Patricia Lawford, the president's sister; Steven Smith; Gen. Maxwell Taylor and Roland Evans. Denver Post file ( img0143A )

President Kennedy, second from right, and the first lady attend the first America's Cup race Sept. 9, 1962, in Newport, R.I. Kennedy Library Archives/Newsmakers ( 817509 )

Sen. Kennedy and wife Jacqueline cruise aboard the Marlin for a sail around Nantucket Sound on July 19, 1960. The Kennedys were on vacation in Hyannisport. Harvey Georges, Associated Press file ( JACK AND JACKIE VACATION 1960 )

Sen. Kennedy and his bride, the former Jacqueline Bouvier, relax on a Cape Cod dune on Nov. 6, 1953. A Washington socialite, Jacqueline had a brief journalistic experience as a photographer. ( img0004B )

Sen. Kennedy and wife Jacqueline pose with their son John on Dec. 10, 1960. AFP/Getty Images ( ARP1165733 )

Caroline Kennedy arrives from Washington with her father, President-elect John F. Kennedy, as they head to their Palm Beach oceanfront home on Dec. 5, 1960. Denver Post file ( img0858A )

Kennedy and family outside their Massachusetts home on Nov. 9, 1960. Denver Post file ( img447.jpg )

Caroline Kennedy peeps over the shoulder of her father, Sen. Kennedy, as he gave her a piggyback ride on Nov., 1960, at the Kennedy residence in Hyannis, Mass. Associated Press file ( JOHN F. KENNEDY CAROLINE )

A family portrait with the Kennedy's first child, Caroline, 2, in 1960. ( img0001116AA.JPG )

The Kennedy family gathers for a portrait on Nov. 9, 1960, in Hyannis, Mass., after John F. Kennedy was elected president. Standing from left, are, Mrs. Bob Kennedy, Steve Smith and wife Jean Kennedy, President John F. Kennedy, Bob Kennedy, daughters Patricia Lawford, Sargent Shriver, Joseph P. Kennedy with wife seated in front of him, Mrs. John F. Kennedy and Ted Kennedy. Denver Post file ( img0100A )

President Kennedy sits with Jacqueline and Caroline at Hyannis, Mass., on July 25, 1960. Associated Press file ( JOHN KENNEDY )

John Jr., son of President and Mrs. Kennedy, stands gleefully in his carriage on the south grounds of the White House as his dog, Charlie, stands in the foreground in 1962. Associated Press file ( img0018B )

Jacqueline with John Jr. and Caroline on Nov. 28, 1962. Denver Post file

Jacqueline goes for a ride with Caroline while holding John Jr. on Nov. 19, 1962. John F. Kennedy Presidential Library and Museum ( ST-498-1-62 )

President Kennedy greets John Jr. Newsmakers ( 38109111jfk2_20010628_18150.jpg )

Jacqueline walks with John Jr. on April 15, 1963.

Three-year-old John F. Kennedy, Jr., kicks back and forth in a rocking chair, something his father was instrumental in re-popularizing, in the White House office of the president's secretary, Mrs. Evelyn Lincoln, in 1963. Denver Post file ( img0081B )

Secretary Evelyn Lincoln works in the President's office with Kennedy as John Jr. busies himself in 1963. Denver Post file ( img0000346A )

John Jr., Jacqueline, Caroline and the president are pictured at the White House on Aug. 4, 1962. John F. Kennedy Presidential Library and Museum, Boston ( ST-C22-1-62 )

President Kennedy leads Caroline down the portico steps, followed by the first lady with John Jr., for the Black Watch Regiment exhibition on the White House South Lawn on Nov. 13, 1963. Associated Press file ( JFK And Family )

Kennedy poses with members of the younger generation of Kennedys in Hyannis, Mass. on Aug. 3, 1963. John F. Kennedy Presidential Library and Museum

The president and first lady Jackie depart the National Theater on Sept. 25, 1962, in Washington, DC. National Archive/Newsmakers ( 38125716jack_20010711_01481.jpg )

President Kennedy and Jacqueline attend a White House ceremony Feb. 19, 1963, in Washington. National Archive/Newsmakers ( 38125734jack_20010711_01493.jpg )

The president and first lady attend a White House staff Christmas Party on Dec. 7, 1962 in Washington. John F. Kennedy Presidential Library and Museum ( 38662007jko2_20010711_01937.jpg )

Jacqueline and John board a plane on March 9, 1962. Denver Post file

The presidential couple attend a ceremony Nov. 29, 1962, in Washington. National Archive/Newsmakers ( 38125722jack_20010711_01487.jpg )

The first lady and president pose for a photo with his father and mother, Joseph Patrick Kennedy and Rose Fitzgerald Kennedy, at the White House in the early 1960s. AFP/Getty Images ( PAR2003110417153 )

Rose Kennedy stands atop a plane ramp at New York's Idlewild Airport just before departure to Los Angeles and the Democratic National Convention on July 8, 1960. Mrs. Kennedy said she felt that her son would win the nomination. Denver Post file ( img0244A )

Kennedy with brother Joe Jr., left, and father, Joseph, on July 5, 1938, in Southampton on the deck of the French "Normandy" cruise liner after their arrival from the U.S. AFP/Getty Images ( APP2000110376941 )

Sen. Kennedy sits at his home in Georgetown, Mass., with Robert. Three Lions/Hulton Archive/Getty Images ( J144837101 )

President Kennedy and his brothers, Attorney General Robert F. Kennedy, left, and Sen. Edward M. Kennedy stand outside the Oval Office on Aug. 28, 1963. Cecil Stoughton, John F. Kennedy Presidential Library and Museum ( ST-398-3-63 (crop) )

Joseph Kennedy and family, photographed at the Vatican in Rome in 1938. Denver Post file ( img0083A )

Rose Kennedy stands with daughters Kathleen, left, and Rosemary in London in 1938. Denver Post file ( img0086A )

Ambassador Joseph Kennedy, center, holds Edward Kennedy for a photo with family members, from left: Patricia, Kathleen, Eunice Rosemary and Joseph, Jr. In front are Robert and Jeanne. Denver Post file ( img0097A )

Joseph Kennedy, the new U.S. ambassador to the Court of St. James, jestingly said he didn't want to add to Britain's housing problem by bringing over his family: Mrs. Kennedy and nine children all at once. So they arrived in small groups. Teddy leads the way as, from left, Kathleen, Mrs. Kennedy, Patricia, Jean and Bobby walk along. Denver Post file ( img0098A )

Kennedy visited his family homestead in County Kerry, Ireland, in June 1963, where these family headstones stood. Denver Post file ( img0291A )