A United Launch Alliance Atlas-V rocket launching with the U.S. Air Force GPS 2F-11 satellite Oct. 31, 2015. The USAF believes that ULA had options that would have allowed it to bid on the initial GPS III launch in 2018, but given ULA's RD-180 engine supply, the company decided instead to cede that launch to SpaceX. Photo Credit: John Studwell / AmericaSpace