SpaceX launches intelligence-gathering satellites for the National Reconnaissance Office

The National Reconnaissance Office flew its 13th mission supporting an intelligence-gathering constellation it calls the “proliferated architecture” on Monday night. As with the first dozen missions, this batch of satellites (of an undisclosed quantity) will fly to orbit on a SpaceX Falcon 9 rocket. The mission, dubbed NROL-172, launched from Space Launch Complex 4 East at Vandenberg Space Force Base. Liftoff happened at 7:13:50 p.m. PDT (10:13:50 p.m. EDT / 0213:50 UTC), nearly four hours after the opening of the window. More

(Source: SpaceFlight Now - May 12)