THE NATIONAL SECURITY ALLIANCE WHO WE ARE The National Security Alliance (NSA) is a network of locally owned and operated contract security companies who work together to provide customers with quality contract security services through-out the United States and Canada. This unique alliance provides its customers with a local owner/operator that has years of experience, a proven track record, strong local recognition and longstanding ties to the community in which they live and work in. All NSA member companies are run by business owners who understand the marketplace they operate in. They run successful businesses because they have attuned their business model to match the areas in which they operate.