End of an era: Delta 4 Heavy soars one last time
COLORADO SPRINGS — In a historic sendoff, United Launch Alliance on April 9 launched a classified National Reconnaissance Office spy satellite on the final flight of the Delta 4 Heavy rocket.
COLORADO SPRINGS — In a historic sendoff, United Launch Alliance on April 9 launched a classified National Reconnaissance Office spy satellite on the final flight of the Delta 4 Heavy rocket.