In 1985, President Ronald Reagan requested the expansion of the program and Congress enacted the International Security and Development Cooperation Act, which expanded the statutes that supported the Federal Air Marshal Service. The FAM program was begun in response to domestic hijackings and FAM operational flights were almost exclusively conducted on domestic U.S. flights until 1985. After the hijacking of TWA Flight 847 in 1985 and the enactment of the International Security and Development Cooperation Act, the number of FAMs was increased and their focus became international U.S. air carrier operations. Due to resistance of several countries including the United Kingdom and the Federal Republic of Germany to having individuals carrying firearms entering their countries, the coverage of international flights was initially limited. Resistance to the entrance of armed personnel to their countries was overcome through negotiations and agreements about the terms and handling of weapons when they were brought in country. Hence the FAMs could operate worldwide in carrying out their mission to protect U.S. aviation from hijackings.