By The Associated PressSat Sep 16, 8:00 PM ET

Today is Sunday, Sept. 17, the 260th day of 2006. There are 105 days left in the year.

Today's Highlight in History:

On Sept. 17, 1787, the Constitution of the United States was completed and signed by a majority of delegates attending the constitutional convention in Philadelphia.

On this date:

In 1862, Union forces hurled back a Confederate invasion of Maryland in the Civil War's Battle of Antietam.

In 1920, the American Professional Football Association — a precursor of the National Football League — was formed in Canton, Ohio.

In 1939, the Soviet Union invaded Poland, more than two weeks after Nazi Germany had launched its assault.

In 1944, during World War II, Allied paratroopers launched Operation Market Garden, landing behind German lines in the Netherlands. The Allies, however, encountered fierce German resistance.

In 1948, the United Nations mediator for Palestine, Count Folke Bernadotte, was assassinated in Jerusalem by Jewish extremists.

In 1966, "Mission: Impossible" premiered on CBS.

In 1976, NASA publicly unveiled the space shuttle Enterprise at ceremonies in Palmdale, Calif.

In 1978, after meeting at Camp David, Israeli Prime Minister Menachem Begin and Egyptian President Anwar Sadat signed a framework for a peace treaty.

In 1980, former Nicaraguan president Anastasio Somoza was assassinated in Paraguay.

In 1986, the Senate confirmed the nomination of William H. Rehnquist to become the 16th chief justice of the United States.

Ten years ago: A nonpartisan commission recommended that Ross Perot be denied a spot in presidential debates, saying he had no realistic chance of winning the White House; Perot vowed to sue. Former Vice President Spiro T. Agnew died in Berlin, Md., at age 77.

Five years ago: Six days after 9/11, stock prices nose-dived but stopped short of collapse in an emotional, flag-waving reopening of Wall Street; the Dow Jones industrial average ended the day down 684.81 at 8,920.70. President Bush said the United States wanted terrorism suspect Osama bin Laden "dead or alive." President Bush visited a mosque in Washington as he appealed to Americans to get back to everyday business and not turn against their Muslim neighbors.

One year ago: Two passengers were killed, more than 80 people injured when a Chicago commuter train derailed while changing tracks at high speed. Insurgents assassinated a Kurdish member of parliament, his brother and their driver in an ambush north of Baghdad.

Today's Birthdays: Actor David Huddleston is 76. Senate Finance Chairman Charles E. Grassley, R-Iowa, is 73. Actor Paul Benedict is 68. Supreme Court Justice David H. Souter is 67. Singer LaMonte McLemore (The Fifth Dimension) is 67. Singer Fee Waybill is 56. Actress Cassandra Peterson ("Elvira, Mistress of the Dark") is 55. Comedian Rita Rudner is 50. Movie director Baz Luhrmann is 44. Singer BeBe Winans is 44. Actor Kyle Chandler is 41. Rapper Doug E. Fresh is 40. Actor Malik Yoba is 39. Rock musician Keith Flint (Prodigy) is 37. Actor Matthew Settle is 37. Rapper Vinnie (Naughty By Nature) is 36. Rock singer Anastacia is 33. Rhythm-and-blues singer Marcus Sanders (Hi-Five) is 33. Actress-singer Nona Gaye is 32. Pop singer Maile Misajon (Eden's Crush) is 30. Rock musician Chuck Comeau (Simple Plan) is 27. Country singer Desi Wasdin (3 of Hearts) is 23.

Thought for Today: "The great tragedy of life is not that men perish, but that they cease to love." — W. Somerset Maugham, English author and dramatist (1874-1965).