The United States Customs Service (USCS) has the requirement to detect, track, and identify numerous marine, land and airborne targets suspected of entering the United States with illegal drugs. Additionally, the USCS monitors suspected smuggling targets and directs cooperating assets to interdict these targets before a cargo transfer is made. The USCS has established Command, Control, Communications and Intelligence (C3I) centers to coordinate the drug interdiction effort. The Customs National Aviation Center (CNAC) located in Oklahoma City, Oklahoma provides operational, logistical and administrative support. The East and West C3I centers located in Richmond Heights, Florida and Riverside, California perform the tactical operations.