title: Norfolk Naval Shipyard
context: The Norfolk Naval Shipyard, often called the Norfolk Navy Yard and abbreviated as NNSY, is a U.S. Navy facility in Portsmouth, Virginia, for building, remodeling, and repairing the Navy's ships. It is the oldest and largest industrial facility that belongs to the U.S. Navy as well as the most multifaceted. Located on the Elizabeth River, the yard is just a short distance upriver from its mouth at Hampton Roads.
question: What is the largest U.S. Navy shipyard?
answers: Norfolk Naval Shipyard