План Рекс 84: Подготовка к задержанию американских граждан.

Plan by the U. S. to detain American residents
Rex 84B, short for Readiness Exercise 1984 Bravo, was a classified scenario and drill developed by the United States federal government to detain large numbers of United States residents deemed to be "national security threats" in the event that the president declared a National Emergency. The scenario envisioned state defense forces rounding up 500,000 undocumented Central American residents and 4,000 American citizens whom the US Attorney General had designated as "national security threats" as part of the secret Continuity of Government program. These people would be detained at 22 military bases in concentration camps run by the Federal Emergency Management Agency.

The existence of master military contingency plans (of which Rex 84 was a part), Operation Garden Plot and a similar earlier exercise, Lantern Spike, were originally revealed by journalist Ron Ridenhour, who summarized his findings in an 1975 article in CounterSpy magazine. Starting in 1981, the DoD and FEMA began a tradition of bi annual joint exercises to test civil mobilization using the names Proud Saber and Rex 82. In 1984, the scenario involved a US Army rehearsal of airlifting the entire Eighty second Airborne Division (15,000 troops) from Fort Bragg in North Carolina, under the cover of night and flying them to either El Salvador or Nicaragua as a simulated invasion to enforce a state of martial law. This part of the exercise had been code named Rex 84 Night Train, and the overall readiness exercise, involving 34 federal agencies, was code named Rex 84, with FEMA's role in assisting the DoD as Rex 84 Alpha. Later, when the mass detention scenario involving FEMA was added at the request of FEMA director Louis Giuffreda and Reagan Advisor Edwin Meese and personally authorized by Ronald Reagan, the mass detention scenario was code named Rex 84 Bravo. It was modeled on a 1970s Giuffreda Meese Reagan exercise in California known as Operation Cable Splicer. The plan was first discovered by the Christic Institute in 1984 and first revealed in detail in a major daily newspaper by reporter Alfonso Chardy in the July 5, 1987 edition of the Miami Herald. Possible reasons for such a roundup were reported to be widespread opposition to a U. S. military invasion abroad, such as if the United States were to directly invade Central America. To combat what the government perceived as "subversive activities", the plan also authorized the military to direct the movement of civilian populations at state and regional levels, according to Professor Diana Reynolds.

The FEMA role in Rex 84, branded Rex 84B, was brainstormed by Louis Giuffreda as a way to ship arms to the Contras, in violation of the Boland Amendment, a potentially impeachable offense. The states of Texas, Alabama, and Louisiana had established civilian "state defense forces" independent of the national guard, recruiting mercenaries through the magazine Soldier of Fortune. This allowed FEMA to sidestep its own and Department of Defense procurement rules for the weapons needed for mass detentions and sidestepped the Posse Comitatus Act, which prohibits deploying US military forces in the United States to enforce civilian laws against civilians. The Pentagon shipped the state security forces massive amounts of arms and military equipment for the exercise, and the defense forces were instructed to re value the equipment at its higher replacement value. At the end of the exercise, the security forces only returned equipment at the value originally shipped, leaving surplus military equipment in the hands of civilians. These weapons were then "donated" to Central Intelligence Agency front charities and shipped to the Contras in Central America under the cover of humanitarian supplies.

Rex 84B's scenario of mass detention of US citizens and residents under an unrealistic pretext and without congressional debate is often cited by civil libertarians opposing the militarization of police and has also given rise to the FEMA camps conspiracy theory. The existence of the ADEX list presaged mass restrictions on movement without due process such as the no fly list. The exercise's fictional scenario of viewing Central American refugees as potential subversives who might organize themselves into terrorist cells was sent to the FBI as fact, leading to a crackdown by border authorities and federal government hostility to the American Sanctuary Movement. In 2003, Congressman Jim McDermott cited Rex 84B in raising concerns about martial law in the United States as part of the Global War on Terror. The Rex 84 scenario is unlikely to be constitutional because in 2018, the US Supreme Court overturned its decision in Korematsu v. United States, the 1944 decision upholding the mass internment of Japanese Americans without due process during World War II.