**This launch date is only tentative and is subject to change** A United Launch Alliance Delta 4 rocket will launch the U.S. Air Force’s second third-generation navigation satellite for the Global Positioning System. The satellite is built by Lockheed Martin. The Air Force previously planned to launch the third GPS 3-series satellite on this mission. The rocket will fly in the Medium+ (4,2) configuration with two solid rocket boosters.
**Delayed from Nov. 1, Dec. 13 and April 4.**