Naval Support Activity (NSA) refers to a type of military installation that provides logistical and operational support to naval forces. These facilities are essential for maintaining the readiness and effectiveness of the United States Navy and often include services such as supply, maintenance, and training. NSA installations can be found both domestically and internationally, often located near major naval bases. They play a crucial role in ensuring that naval operations run smoothly and efficiently, supporting various missions and activities of the Department of Defense.