The U.S. Air Force supported the successful launch of a United Launch Alliance Atlas V rocket carrying the Air Force's eighth Block IIF navigation satellite for the Global Positioning System at 1:21 p.m. EDT Oct. 29, 2014, from Space Launch Complex 41, Cape Canaveral Air Force Station, Fla. GPS is a space-based, worldwide navigation system providing users with highly accurate, three-dimensional position, velocity and timing information 24 hours a day in all weather conditions and GPS satellites also serve and protect our warfighters by providing navigational assistance for U.S. military operations on land, at sea, and in the air. (United Launch Alliance photo/John Studwell)