When we got to Bremerhaven, we found that instead of going to America, we could ship out to the Persian Gulf and join the U.S. Central Command (the RDF, some still call it)." * A map of southern Iran. * Character generation tables for Americans (USMC, USN, and USAF), British, Iranians, Iraqis, and others. * An Order of Battle for the remaining forces in the U.S., Soviet, Iranian, Iraqi, Saudi, and the British, among others. * Details and specifications in 2000 terms, of over 30 vehicles and weapons, including selected French, Israeli, British, German, and Brazilian equipment. * Short descriptions of the major personalities and organizations opposing each other in the Persian Gulf. * A mission resolution system, allowing referees to take their players on a variety of military missions, ranging from conventional patrol and escort missions to special operations deep behind the enemy lines.
For those playing Twilight: 2000, first edition, the RDF Sourcebook adds a whole new theatre in southern Iraq/Iran. Command and control have not broken down as they have in Europe, so there is opportunity for more structured, military operations as opposed to the survival-focused gaming in the core setting. Rules exist for creating characters native or deployed to the Persian Gulf region as well as special operations forces (U.S. Navy Seals, Delta Force, U.S. Marine Force Recon, etc.). Equipment likely to be found in the region is also included, adding to the gear list.
Other editions of Twilight: 2000 can take advantage of the setting; it's a popular conceit to use the Twilight: 2000, first edition setting and timeline with Twilight: 2000, second edition, for example.
Unlike the Twilight: 2000, first edition boxed set, there isn't a well-developed scenario in the RDF Sourcebook. Instead, a simple mission creation system is provided to get a group started with the more ordered, operational gameplay inherent in the setting.