My family has always supported my activities, whether it was doing combat in Korea, flying progressively and challenging fighter-jet aircraft in Europe, or studying for a doctor's degree at MIT. They have been always very supportive and understanding of the challenges and risks involved in my career. A family needs to work as a team, supporting each other's individual aims and aspirations.

Like actors and writers who are on and off again in terms of employment, I had a very unstructured life.

America can take man to the moon, and America can take men to Mars - and beyond.

We need the next generation to be motivated and to push technological boundaries, to seek out new innovations.

Weve got to go [back to the moon]. But we dont want to stay too long. ... The ultimate goal is Mars.

The way I see it, what is going to come out of the moon activities is a respect for U.S. leadership.

My own American Dream was to serve my country as best I could and make a difference in America - and in the world.