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Yale Enforcement Services is a Belleville, IL-based company in the Business Services sector.
Citadel Security Inc is a Long Beach, CA-based company in the Business Services sector.
Mc Pherson Group is a Satellite Beach, FL-based company in the Business Services sector.
Advanced Technology Systems Company is a Mc Lean, VA-based company in the Business Services sector.
G4S is the leading global, integrated security company, specializing in the provision of security services and solutions to customers. Our mission is to create material, sustainable value for our customers and shareholders by being the supply partner of choice in all of our markets. G4S is quoted on the London Stock Exchange and has a secondary stock exchange listing in Copenhagen. G4S is active in over 110 countries and has 623,000 employees.