Boeing’s CST-100 Starliner spacecraft is poised atop a fueled United Launch Alliance (ULA) Atlas V rocket at Cape Canaveral Air Force Station’s (CCAFS) Space Launch Complex 41 in Florida for the program’s first-ever Integrated Day of Launch Test on Dec. 6, 2019. The rocket’s booster and Centaur upper stage have been filled with propellants for this full run-through of the launch countdown. The rehearsal is practice for Boeing’s upcoming uncrewed Orbital Flight Test to the International Space Station for NASA’s Commercial Crew Program.