Black helicopters is a term which became popular in the US militia movement and its associated political circles in the 1990s as a symbol and warning sign of an alleged conspiratorial military takeover, though it has also been associated with men in black and similar conspiracies. Rumors circulated that, for instance, the UN patrolled the States with unmarked black helicopters, or that federal agents used black helicopters to enforce wildlife laws.
The concept springs from the basic truth that many government agencies and corporations do use helicopters, and that some of these helicopters are dark-colored or black. For instance, dark-colored military helicopters were deployed in the standoff at Ruby Ridge. Earlier tales from the 1970s linked them with UFO conspiracy theories.
In the early 1970s, the CIA operated a black Hughes 500P helicopter in Vietnam, in order to place phone taps. Test flights began at Culver City, California, in 1971. It was noted for its low noise emission, and given the nickname ‘The Quiet One.’ After the mission assigned to it had been completed, the helicopter was returned to California and had most of the special features stripped out by mechanics. It was transferred to the ownership of the Pacific Corporation of Washington, DC.
The Army regularly conducts both exercises and operational missions in American airspace. Some of these exercises have taken place in densely populated cities, and most operational missions are tasked in narcotics interdiction in the American Southwest and out of Florida and Puerto Rico. By extensive use of IR, Radar, GPS and night vision devices, as well as other classified means, they are able to fly in zero visibility conditions with no running lights.