Citadel Security is a veteran-owned organization with over 40 years of combined security and military experience and has been ... operating as a company since April 2007. Citadel Security USA is headquarters is located in Missouri with branch offices located in Denver, Grand Junction, and Salt Lake City. Our organization provides professional security services for a full spectrum of governmental agencies, large retailers, utility infrastructure, commercial and residential complexes, and healthcare facilities. Additionally Citadel has earned the reputation as the premier security company by providing security for large and small event. Our special projects division is able to assist in close protection, transportation, and investigative projects. read more