"That's one small step for man, one giant leap for mankind." For a minimum bid of $14,000, you can own the American flag that was flown aboard the Apollo 11 mission on July 20, 1969, the day when astronauts Buzz Aldrin and Neil Armstrong first walked on the moon. The auction is available on the Nate D. Sanders site and ends on Feb. 23. The flag is attached to a board with auto-penned signatures from the mission's crew - Neil Armstrong, Edwin "Buzz" Aldrin and Michael Collins, along with the words: ''This flag traveled to the Moon on Apollo 11, the first manned lunar landing / July 20, 1969." The American flag measures 3.75" by 5.75" and is in "near fine condition," according to the auction. The flag comes with a letter of authenticity from Catherine Whipkey, whose husband Bill was a former employee at the Johnson Space Center.