Cape Canaveral Air Force Station, Florida. (May 20, 2015) A United Launch Alliance (ULA) Atlas V rocket successfully launched the AFSPC-5 satellite for the U.S. Air Force at 11:05 a.m. EDT today from Space Launch Complex-41. This is ULA’s fifth launch in 2015 and the 96th successful launch since the company was formed in December 2006.

[SatNews] When there's a launch there are always several agencies/companies involved, and subsequently an announcement from each. Here's the latest from the U.S.A.F. regarding today's liftoff.

LOS ANGELES AIR FORCE BASE, California. — The U.S. Air Force and its mission partners successfully launched the AFSPC 5 mission aboard the Space and  Missile Systems Center (SMC) procured United Launch Alliance (ULA) Atlas V launch vehicle from Space Launch Complex (SLC)-41 at Cape Canaveral Air Force Station, Florida at 11:05 a.m. EDT.  There were no issues reported with the launch.

"Today's successful launch is the direct result of dedicated
government/contractor teamwork and focus on mission success," said Lt. Gen.Samuel Greaves, commander of SMC. "This marks EELV's 83rd  successful launch and we will continue our unwavering focus on mission success."

This was the fourth time that the X-37B has flown on an Atlas V launch
vehicle.  The heart of the first stage is the common core booster which is
about 106 feet in length and more than 12 feet in diameter. The common core booster can provide thrust up to 850,000 pounds at full throttle. 

Air Force Space Command's Space and Missile Systems Center, located at Los Angeles Air Force Base, California, is the U.S. Air Force's center of acquisition excellence for acquiring and developing military space systems.Its portfolio includes the Global Positioning System, military satellite communications, defense meteorological satellites, space launch and range systems, satellite control networks, space based infrared systems and space situational awareness capabilities.