A United Launch Alliance Atlas 5 rocket, designated AV-063, will launch the fifth Mobile User Objective System (MUOS) satellite for the U.S. Navy. Built by Lockheed Martin, this U.S. military spacecraft will provide narrowband tactical communications designed to significantly improve ground communications for U.S. forces on the move. The rocket will fly in the 551 vehicle configuration with a five-meter fairing, five solid rocket boosters and a single-engine Centaur upper stage.