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The Naval Sea Systems Command (NAVSEA) is the largest of the United States Navy's five "systems commands," or materiel (not to be confused with "material") organizations. NAVSEA consists of four shipyards, nine "warfare centers" (two undersea and seven surface), four major shipbuilding locations and the NAVSEA headquarters, located at the Washington Navy Yard, in Washington D.C.
NAVSEA's primary objective is to engineer, build and support the U.S. Navy's fleet of ships and its combat systems. NAVSEA accounts for nearly one-fifth of the Navy's budget, with more than 100 acquisition programs under its oversight. The five Navy systems commands are:
The Naval Sea Systems Command was established on 1 July 1974 with the merger of the Naval Ship Systems Command with the Naval Ordnance Systems Command. The Naval Ship Systems Command was established in 1966 replacing the Navy's Bureau of Ships (BuShips). Established in 1940, BuShips succeeded the Bureau of Construction and Repair, which had been responsible for ship design and construction, and the Bureau of Engineering, which had been responsible for propulsion systems.
The current[when?] NAVSEA facilities are:
Naval Sea Logistics Center
Vice Adm. William H. Hilarides became the 43rd Commander of NAVSEA on June 7, 2013. 
On Monday September 16, 2013, a 34-year-old former U.S. Navy veteran, Aaron Alexis, gained access to the yard using a valid ID card that had been issued to him as an IT contractor working with a company called The Experts entered Building 197 and Killed 12 people. The suspect was killed in a shootout with police. The victims that were killed are as follows.
- Michael Arnold, 59 — Martin Bodrog, 54 — Arthur Daniels, 51 — Sylvia Frasier, 53 — Kathy Gaarde, 62 — John Roger Johnson, 73 — Frank Kohler, 50 — Mary Francis Knight, 51 — Kenneth Bernard Proctor, 46 — Vishnu Pandit, 61 — Gerald L. Read, 58 — Richard Michael Ridgell, 52
It was the deadliest shooting at a U.S-based military installation since Maj. Nidal Hasan killed 13 people and wounded 30 others in 2009 at Fort Hood in Texas. He was convicted last month and sentenced to death.
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