Revolutionizing U.S. Military Power: The Impact of the 'Big Five' in the 70s and 80s
In the 1970s and 1980s, the U.S. Army launched the "Big Five" procurement programs to regain technological edge and enhance conventional forces post-Vietnam War. These included the M1A1 Abrams tank, Bradley Fighting Vehicle, Patriot air-defense system, AH-64 Apache, and UH-60 Black Hawk helicopter.
Source: nationalinterest.org