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  2. Universal Protection Service - Wikipedia

    en.wikipedia.org/wiki/Universal_Protection_Service

    Universal Protection Service offered security services and was located in Santa Ana, California. It was a division of Universal Services of America, with three other divisions: Universal Building Maintenance (janitorial and maintenance), Universal Protection Security Systems (security system installation and management), and Universal Fire/Life Safety (fire safety planning and training). [4]

  3. Allied Universal - Wikipedia

    en.wikipedia.org/wiki/Allied_Universal

    Allied Universal is an American private security and staffing company, based in Conshohocken, Pennsylvania and Irvine, California. Formed in 2016 by the merger of AlliedBarton and Universal Services of America , [ 5 ] Allied Universal is the world's largest provider of private security guards .

  4. UL (safety organization) - Wikipedia

    en.wikipedia.org/wiki/UL_(safety_organization)

    UL headquarters in Northbrook, Illinois. Underwriters Laboratories Inc. was founded in 1894 by William Henry Merrill.After graduating from the Massachusetts Institute of Technology (MIT) with a degree in electrical engineering in 1889, Merrill went to work as an electrical inspector for the Boston Board of Fire Underwriters. [9]

  5. AlliedBarton - Wikipedia

    en.wikipedia.org/wiki/AlliedBarton

    AlliedBarton was founded as Allied Security in 1957 in Pittsburgh, Pennsylvania as a provider of contracted security guards and related services. [3]In 2000, King of Prussia, Pennsylvania-based Spectaguard acquired Allied Security and took on the Allied Security name. [4]

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  7. Guardsmark - Wikipedia

    en.wikipedia.org/wiki/Guardsmark

    Guardsmark was a major provider of security services in North America, Puerto Rico and the United Kingdom.Founded in 1963, Guardsmark was the fourth largest security company and the only major provider privately held by one family.

  8. G4S - Wikipedia

    en.wikipedia.org/wiki/G4S

    With over 533,000 employees, [2] by 2012 it was the largest European and African private employer. [5] [6] The company has been criticised and involved in numerous controversies. Formerly a dual-listed company with listings on the Copenhagen and London stock exchanges, G4S was purchased by Allied Universal in April 2021.

  9. Protective Services Battalion - Wikipedia

    en.wikipedia.org/wiki/Protective_Services_Battalion

    The Protective Services Battalion (shortened to USAPSB and, officially, the U.S. Army Protective Services Battalion) is a United States Army military police unit responsible for the protection of the United States Secretary of Defense, the United States Army Chief of Staff, and other senior civilian and military officials of the United States Department of Defense (DoD) and U.S. Army. [3]