Launch of the secretive X-37B Orbital Test Vehicle (OTV) on its fourth mission, AFSPC-5, on May 20, 2015, riding a United Launch Alliance Atlas-V 501 rocket to orbit from Cape Canaveral AFS Space Launch Complex 41. Onboard are a variety of small satellites & experiments for the NAVY, National Reconnaissance Office (NRO), NASA, & a privately-funded Lightsail solar-sail developed by The Planetary Society.

Coverage provided for AmericaSpace.