On May 20, 2015 at 15:05 UTC the “Atlas-5” rocket-carrier was launched from Cape Canaveral launch site of US Air Force. The launch was performed by United Launch Alliance supported by the 45th Space Wing of US Air Force. The rocket orbited the US Air Force’s reusable X-37B spaceplane. It is the fourth mission of the reusable X-37B spaceplane. But the military won’t say which of its two X-37B spaceplanes was launched on May 20, the first craft which has flown twice or the second vehicle that has flown once. Ten Cubesats were also put into low-Earth orbit by the “Atlas-5” rocket.

On May 16, 2015 at 05:47 UTC the Russian "Proton-M” rocket-carrier was launched from Baykonur Cosmodrome. The rocket equipped with the "Briz-M” booster was to orbit the “MexSat-1” communication satellite. The Proton rocket’s third stage failed about eight-and-a-half minutes after liftoff, just before the booster was programmed to disconnect from a Breeze M upper stage designed to guide the Mexican government’s “MexSat-1” satellite into an orbit.

On May 8, 2015 at 02:04 UTC the Russian “Progress M-27M” spacecraft re-entered Earth’s atmosphere over the South Pacific after spinning out of control following liftoff April 28 with supplies for the International Space Station.