National Security Industries is a privately owned and operated provider of Security Guard Services. Headquartered in San Jose , CA. with additional locations in San Francisco, Santa Cruz, Sacramento, San Diego, and Los Angeles, CA. * National Security Industries is a state licensed 24/7 Professional Specialized Security Guard Agency * Established in 1995. With a staff of 400 trained guards we service a diverse client base throughout The Western Region * Today, National Security Industries provides security services to a group of 100+ clients. We employ and develop security professionals throughout California, Colorado, and Arizona Where others see only challenges, NSI sees opportunities to create complete solutions thar deliver strategic benefit to our clients