The domestic side of the Enforcement Division is involved in monitoring Federal fugitive cases originating at one or more of 94 district offices throughout the United States. The Division is also involved in developing, analyzing, and testing new equipment such as radio communications and emergency systems to assist the field in obtaining the newest and best support items available. In addition, the Division is responsible for establishing the "15 most wanted" program within the U.S. Marshals Service and for developing, managing, and operating the Fugitive Investigative Strike Team (FIST) Program. These strike teams have contributed significantly to overall efforts of the Federal criminal justice system to assist State and local law enforcement agencies in combating crime. The FIST Program has been expanded to include cooperative efforts in Central American and Caribbean countries. The Enforcement Division's International Branch, formed in 1984, is primarily responsible for U.S. Marshals Service participation in Interpol. The Division handles all fugitive matters coming to the attention of Interpol. The International Branch is also responsible for coordinating all international extraditions.