Founded in 1955, U.S. Security Associates, formerly known as Advance Security Engineering, is one of the largest security firms in the United States that provides security guard services. The company operates offices in more than 130 cities in 45 U.S. states. It works with a team of over 26,000 employees. U.S. Security Associates has achieved ISO 9001:2000 certification. U.S. Security Associates offers event security, loss prevention, security consultation and risk analysis solutions. It also provides unarmed and armed security officers The company serves several the financial institutions, office buildings, residential communities, colleges, universities, and distribution and health care facilities, as well as the retail, government, manufacturing and industrial industries. U.S. Security Associates clients include Abbott Laboratories, CB Richard Ellis, CVS, Federal Express, Georgia-Pacific, J.P. Morgan, Lockheed Martin, Merrill Lynch, Procter & Gamble, Union Pacific and UPS.