M-1956 load-carrying equipment
The M-1956 load-carrying equipment (LCE), also known as the individual load-carrying equipment (ILCE), was developed by the U.S. Army and first issued in the early 1960s. The M-1956 LCE was designed to replace the M-1945 Combat Pack, the M-1923 cartridge belt, the M-1936 pistol belt and the M-1937 BAR magazine belt.
Source: Wikipedia — M-1956 load-carrying equipment (CC BY-SA 4.0)