Allied Universal Security Services is a security officer company based in the United States. It is a combination of earlier companies - Barton Protective Services, Spectaguard, Initial and Allied Security. By 2016, the company expects its merger with Universal Services of America to be finalized, with the newly formed conglomerate being named AlliedUniversal. Allied Security, Inc. was founded in 1957 in Pittsburgh, Pennsylvania. The company provided contracted security guards and related services. In 2000, Philadelphia, Pennsylvania-based, Spectaguard acquired Allied to form Allied Security and as a result became the fourth largest security company in the United States. Three years later, in 2003, Allied Security acquired Professional Security Bureau. Within a year, in 2004, Allied acquired Security Systems Inc. (SSI) of Malden, MA and Barton Protective Services to form AlliedBarton Security Services - creating the largest American-owned contract security services company in the United States. Two years later, in 2006, AlliedBarton acquired Initial Security for $73.6 million.