One of them,the Apollo-11, traveled to the moon just seven months after the last X-15 flight.

VOA: special.2010.07.07

One piece of equipment on Apollo Fourteen was a light-weight vehicle with two wheels.

VOA: special.2009.07.29

Two-and-one-half minutes after the Apollo Eleven launch, the first-stage rocket separated from the spacecraft.

VOA: special.2009.07.15

Apollo was one of the great risks this country took that paid off gloriously, allowing Humanity to make its first step on another world.

FORBES: Curiosity's Successful, Glorious Triumph on Mars

It also managed to get a relatively good price from Apollo, said one analyst who wished to remain anonymous.

FORBES: Magazine Article

It occurred between two Apollo missions, with one crew just returned from the Moon and another preparing for launch.

BBC: NEWS | Science/Nature | Spacecraft go to film Sun in 3D