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Tri-S Security Corporation (Tri-S) is an aggregator of guard services, providing equipment and security services to various government agencies and private sector through its two direct, wholly owned subsidiaries, Paragon Systems and Cornwall. The
Andrews International (AI), headquartered in Los Angeles, California, is a full service provider of security and risk mitigation services, and one of the ten largest private security service providers in the United States. The firm's portfolio of
Egert Riley and De Roo Assoc is a Catonsville, MD-based company in the Business Services sector.
SPY Source is a Des Plaines, IL-based company in the Business Services sector.
Able Patrol and Guard is a San Diego, CA-based company in the Business Services sector.