The final space shuttle mission will have the smallest crew in decades and the three men and one woman were still in high school and college when the first shuttle flew.
History will remember these final four as bookending an era that began with two pilots who boldly took a shuttle for a two-day spin in 1981 without even a test flight.
On Friday, this last crew will make NASA's 135th and final shuttle flight.
It will be years before the United States sends its own spacecraft up again.
Commander Christopher Ferguson, co-pilot Douglas Hurley, Rex Walheim and Sandra Magnus are delighting in their good luck -- their flight was a late add by NASA.
The crew of space vets with seven flights among them say they're honored to be delivering one last load of supplies to the International Space Station.
Ferguson and his crew say they want this final flight to be a celebration.
