The Air Force plans to launch its fourth X-37B mission, designated OTV-4 and codenamed AFSPC-5, aboard an Atlas V rocket from Cape Canaveral Air Force Station tomorrow, May 20, 2015. The mission will test a Hall Effect Thruster in support of the Advanced Extremely High Frequency (AEHF) communications satellite program, and will also carry a NASA materials mission.
A United Launch Alliance Atlas V rocket carrying an Air Force's X-37B space plane rolled to its Launch Complex 41 pad at Cape Canaveral Air Force Station on May 19, 2015.
US Air Force X-37B Space craft