Definition: allegedly a group of twelve high-ranking scientists, military leaders, and government officials that was formed by executive order of President Harry Truman to investigate the UFO phenomenon. MJ-12 was first brought to public attention with the 1987 release of the MJ-12 documents. These documents purported to be copies of top-secret documents given by an anonymous "insider" to film producer Jaime Shandera.

Also Known As: MJ-12, Maj-12