(AP) - The first astronauts to walk on the moon want President Barack Obama to aim for a new destination: Mars.

The crew will be honored by the President at the White House later today.

On the 40th anniversary of man's first landing on the moon, Ohioan Neil Armstrong and the other Apollo 11 crewmen meet today with Obama at the White House.

Yesterday, the astronauts made one of their few joint public appearances but didn't get soggy with nostalgia. They spoke about the future.

A packed crowd at the Smithsonian Institution's National Air and Space Museum heard second man on the moon Buzz Aldrin make a pitch for Mars.

He said the best way to honor the Apollo astronauts is to boldly go again on a new mission of exploration.