Atlas V GPS IIF-11 Mission ArtworkOct. 29, 2015, 7:55 p.m. EDT: During final launch preparations of the ULA Atlas V launch vehicle carrying GPS IIF-11 for the United States Air Force, a leak was discovered in a ground support equipment valve for launch pad water suppression system. The valve will require repair or replacement. The team is proceeding with these actions, and the launch has been rescheduled for Saturday, Oct. 31.

Atlas V GPS IIF-11 Mission Overview

: A United Launch Alliance Atlas V 401 will launch the GPS IIF-11 mission for the U.S. Air Force.

Date/Site/Launch Time: Saturday, Oct. 31, 2015, from Space Launch Complex-41 at Cape Canaveral Air Force Station, Florida. The 19-minute launch window opens at 12:13 p.m. EDT.

The live broadcast will begin at 11:53 a.m. EDT.

Mission Description: GPS satellites serve and protect our warfighters by providing navigational assistance for U.S. military operations on land, at sea, and in the air. Civilian users around the world also use and depend on GPS for highly accurate time, location, and velocity information.

GPS IIF-11 is one of the next-generation GPS satellites, incorporating various improvements to provide greater accuracy, increased signals, and enhanced performance for users.

Launch Notes: GPS IIF-11 will be the third GPS mission ULA launches in 2015: GPS IIF-9 launched on a Delta IV in March, and GPS IIF-10 launched in July. This mission will be ULA’s 11th in 2015 and 102nd since the company was founded in 2006.

Launch Updates: To keep up to speed with updates to the launch countdown, dial the ULA launch hotline at 1-877-852-4321 or join the conversation at, and; hashtags #GPSIIF11, #AtlasV

Go Atlas! Go Centaur! Go GPS IIF-11!