George H. W. Bush

Former president George H. W. Bush attends an NFL football game between the Houston Texans and Cincinnati Bengals, Houston, Nov. 23, 2014.

Former president George H.W. Bush, strapped to Sgt. 1st Class Mike Elliott, a retired member of the Army's Golden Knights parachute team, float to the ground during a tandem parachute jump near Bush's summer home in Kennebunkport, Maine, June 12, 2014.

In this Sept. 21, 2013 photo, former president George H.W. Bush prepares to sign the marriage license of longtime friends Helen Thorgalsen (right) and Bonnie Clement (left) in Kennebunkport, Maine. Bush was an official witness at the same-sex wedding, his spokesman said, Sept. 25, 2013.

Former president George H.W. Bush shakes hands with his son, former president George W. Bush during the dedication of the George W. Bush Presidential Center, Dallas, April 25, 2013.

Former President George H.W. Bush prays with Hurricane Katrina evacuees Rebecca Solomon (left) Terrill Hoskins, 3, LaShonda Hoskins and Ernie Ladd in the Reliant Center adjacent to the Astrodome in Houston, Sept. 5, 2005.

Former U.S. presidents Bill Clinton and George H.W. Bush talk with children as they visit displaced residents from the December tsunami in Weligama, Sri Lanka, Feb. 21, 2005.

President George H.W. Bush, along with unidentified staff members and secret service agents, takes a morning run, at Ft. McNair in Washington, August 5, 1991.

Stephen Levin of Wynnewood, Pa., watches President Bush announce allied forces air strikes against Iraq at an appliance store in Bryn Mawr, Pennsylvania, Jan. 17, 1991.

President George Bush (left) is congratulated by outgoing President Ronald Reagan after Bush took the oath of office as the 41st president of the United States on Capitol Hill in Washington, D.C., Jan. 20, 1989.

President-elect Ronald Reagan, his wife Nancy, Vice President-elect George H.W. Bush, and his wife Barbara wave from the balcony at the Kennedy Center in Washington, Jan. 19, 1981.

George Bush, U.S. ambassador to the United Nations is shown at U.N. headquarters in New York, 1971.

George Bush is sworn in as new director of the Central Intelligence Agency by Supreme Court Associate Justice Potter Stewart (left) as Mrs. Bush and President Gerald Ford look on at CIA headquarters in Langley, Va., Jan. 30, 1976.