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That was a great tribute! I met Astronaut Jim Irwin at a prayer breakfast at Gila Bend Air Force Auxiliary Field, Arizona in 1980. What a treat to meet one of America's space pioneers. Such a humble a gracious gentleman.
Mankind's greatest achievement. Period, end of story. The challenge for the "next" generation to leave similar footprints went by the wayside. It's time for the current generation to go to Mars.
And leave footprints everywhere.