Atlas V MUOS-4 Mission ArtworkAtlas V MUOS-4 Mission Overview

A United Launch Alliance Atlas V 551 will launch the U.S. Navy’s fourth Mobile User Objective System (MUOS-4) satellite, built by Lockheed Martin.

Date/Site/Launch Time: Wednesday, Sept. 2, from Space Launch Complex-41 at Cape Canaveral Air Force Station, Florida. The 44-minute launch window opens at 5:59 a.m. EDT.

Webcast: The live broadcast will begin at 5:39 a.m. EDT.

Atlas V MUOS-4 Webcast Coordinates

Mission Description: The Navy’s Mobile User Objective System (MUOS) is a next-generation narrowband tactical satellite communications system designed using a combination of orbiting satellites and relay ground stations to significantly improve communications for U.S. forces on the move. MUOS will provide new beyond-line-of-sight secure communications capabilities, with smartphone-like simultaneous voice, video and data – to connect military users almost anywhere around the globe.

Launch Notes: MUOS-4 will mark the 56th Atlas V since the vehicle’s inaugural launch in August 2002 and the sixth in the 551 configuration. Previous missions launched on Atlas V 551 missions include three MUOS missions as well as the New Horizons mission to Pluto and the Juno mission to Jupiter.

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: #MUOS #AtlasV

Go Atlas! Go Centaur! Go MUOS-4!