In the United States alone, G4S security guards stand watch over airports, water and power plants, nuclear facilities, immigration detention centers and even, as in the case of Mateen, gated communities.
Since 2008, G4S Secure Solutions - the company's American subsidiary - has received nearly $830 million worth of federal, state and local government contracts, including for the Department of Homeland Security, according to the SmartProcure database. Its private clients include Google and J.P. Morgan Chase.