ULA prepares for final Atlas 5 launch supporting a national security payload

United Launch Alliance is preparing for a seminole moment for its Atlas 5 rocket. The launch vehicle is preparing to launch its 58th and final national security mission on Tuesday. The United States Space Force-51 (USSF-51) mission will also be the 100th national security mission launch for ULA. Following the completion of a launch readiness review on Friday, ULA rolled the rocket to the launch pad at Space Launch Complex 41 (SLC-41) at Cape Canaveral Space Force Station. First motion came shortly after noon on Saturday with the journey wrapping up after 12:30 p.m. EDT. More

(Source: SpaceFlight Now - Jul 28)