NRO satellite flies to orbit in Delta 4’s final West Coast launch

United Launch Alliance launched a classified National Reconnaissance Office spy satellite on a Delta 4 Heavy rocket September 24 at 3:25 p.m. Pacific from Space Launch Complex-6 at Vandenberg Air Force Base, California. NROL-91 is the Delta 4’s final mission from the West Coast. The vehicle last flew in April 2021 when it launched NROL-82. About four minutes into flight, the outer boosters of the three-core Delta 4 Heavy separated. The second stage separated about two minutes later. More

(Source: SpaceNews - Sep 27)