Friends, relatives and fellow astronauts attended a private memorial service for Neil Armstrong, the first man to walk on the moon, at the Camargo Club in Cincinnati Friday.

Those who attended the memorial service include Buzz Aldrin and Michael Collins, who were Armstrong's companions during the 1969 Apollo 11 mission, John Glenn, the first American to orbit Earth, and astronauts like Alan Bean, Charles Duke, Eugene Cernan, Walter Cunningham, James Lovell, William Anders, James McDivitt and Richard Gordon who flew other Apollo flights, ABC News reported.

NASA Administrator Charles Bolden paid glowing tributes to the man who changed the world with "one small step."

"As we take the next giant leap forward, we stand on the shoulders of this brave, reluctant hero," said Bolden, according to NASA.

Sen. Rob Portman said Armstrong "as a reluctant hero."

Others who spoke on the occasion include Armstrong's sons Rick and Mark.

Media were barred from the memorial service.

Armstrong died August 25 at the age of aged 82, following complications resulting from cardiovascular procedures.

Check out the pictures of the memorial service.