NASA astronaut and former U.S. Air Force Col. Bob Behnken is retiring from NASA after 22 years of service. His last day with the agency is Friday, Nov. 11. “Bob Behnken is a distinguished and talented astronaut, and an effective ambassador for our never-ending mission to explore the cosmos,” said Administrator Bill Nelson. “Bob and fellow NASA astronaut Doug Hurley launched into history with their impeccable command of NASA and SpaceX’s Demo-2 mission, and played a pivotal role in helping a new era of commercial space take flight. Along with the entire NASA family, I appreciate Bob’s service t…