Cold War: Approximately 1947 (due to U.S. President Harry Truman’s Truman Doctrine) to 1991 (Operation Desert Storm, collapse of Soviet Union).
In June 1950, the Democratic People’s Republic of Korea (north) invaded the Republic of Korea (south) in an attempt to unite the country (something that had been promised at the end of World War Two). The recently created United Nations essentially declared war and created the United Nations Command, invading Korea in September 1950. The United Nations Command still operates in South Korea, today.
The F-80 had up to six Browning M3 .50 caliber (12.7mm x 99mm) machine guns.
I edited this silent USAF film (by H. E. Reid) showing the re-arming/re-fueling of F-80s on Kimpo, Korea, 19DEC1950:
Cold War Vehicle I-D:
How to fuel & arm your USAF F-86 Sabre in Korea