MUOS-4 Satellite Provides Warfighters Improved and Secure Communications

DULLES, Va.Sep. 2, 2015-- Orbital ATK, Inc. (NYSE: OA), a global leader in aerospace and defense technologies, provided critical hardware for today s United Launch Alliance Atlas V launch from Cape Canaveral Air Force Station, Florida. The company contributed products on the fourth satellite in the U.S. Navy's Mobile User Objective System (MUOS), designated MUOS-4, and the United Launch Alliance (ULA) Atlas V launch vehicle.

MUOS is the next generation in narrowband tactical satellite communications systems. The MUOS constellation, for which Lockheed Martin Space Systems (NYSE: LM) is the prime contractor, will provide mobile warfighters with significantly improved and secure communications.

It was great to see another successful ULA Atlas V launch that flew Orbital ATK-produced structures and components for both the launch vehicle and satellite, said Scott Lehr, President of Orbital ATK s Flight Systems Group. Once again, this is a really good example of the breadth of our product line and the critical role we play in almost every EELV launch.

Using advanced fiber placement manufacturing and automated inspection techniques, Orbital ATK produced three components for the ULA Atlas V vehicle, including the 10-foot diameter composite heat shield that provides essential protection to the first stage engine, the Centaur Interstage Adapter (CISA) that houses the second stage engine and the boattail that adapts from the core vehicle to the five-meter diameter fairing. The structures were fabricated by Orbital ATK at its Iuka, Mississippi, facility. This is the 56th Atlas V launch using Orbital ATK-built composite structures.

The ULA Atlas V rocket flew in the 551 vehicle configuration with a five-meter fairing, five solid rocket boosters and a single-engine Centaur upper stage. Orbital ATK manufactured the Reaction Control System propellant tank for the ULA Atlas V at its Commerce, California facility.

This flight marked the 21st successful flight of the Orbital ATK retro motors. Eight of these solid motors provided thrust for separation of the spent first stage. The ULA Atlas V retrorocket is built at Orbital ATK's Elkton, Maryland, facility.

For the MUOS-4 satellite, Orbital ATK provided multiple components and structures from the following company locations: San Diego, Goleta and Commerce, California; Magna, Utah; and Beltsville, Maryland.

The MUOS-4 is the fourth satellite in the Navy s planned five-satellite MUOS constellation. Once the constellation is complete, MUOS satellites will provide a 16x increase in number of accesses over the current Ultra High Frequency (UHF) satellite system requirement. MUOS-1, MUOS-2 and MUOS-3 launched respectively in 2012, 2013 and January 2015, and are already providing high-quality voice communications. MUOS-5 is expected to launch in 2016.

About Orbital ATK

Orbital ATK is a global leader in aerospace and defense technologies. The company designs, builds and delivers space, defense and aviation systems for customers around the world, both as a prime contractor and merchant supplier. Its main products include launch vehicles and related propulsion systems; missile products, subsystems and defense electronics; precision weapons, armament systems and ammunition; satellites and associated space components and services; and advanced aerospace structures. Headquartered in Dulles, Virginia, Orbital ATK employs more than 12,000 people in 20 states across the U.S. and in several international locations. For more information, visit www.orbitalatk.com.

Source: Orbital ATK

Media Contact:
Bryan Warren, 801-775-1233
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Orbital ATK Aerospace Structures
bryan.warren@orbitalatk.com
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Public and Investor Relations
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