During the Korean war the North Korean troops took over almost the whole Korean peninsula. Only due the US led UN troops intervention did the South Korean survive. After Some back and forth fighting with the US + South Korean troops agains North Korean + Chinese troops did the border stabilize where it stands today. US troops remain in South Korea as a deterrant against Norths invasion and to uphold the peace in the peninsula.
The US contributed the most troops and material during the Korean War .
William C. Westmoreland, Creighton Abrams, and Frederick C. Weyand all commanded MAC-V during the course of US operations in Vietnam.
westmoreland
The Korean War was the first officially intregated US war. It was also the newly formed US Air Force's FIRST war.
General Douglas MacArthur commanded as supreme commander until his relief by President Truman. LGen Matthew Ridgeway was then appointed o the command.
Aproximately 1,789,000 US Servicemen served in the Korean War.
Initially MacArthur (until he suggested using Atomic Bombs and got fired) then Ridgway.
US Army Gen. John J. (Blackjack) Pershing. Nicknamed "Blackjack" because he had commanded black troops during his career. The US Army remained segregated (for African Americans) until 1947.
The answer is not approximate but around 1,500,000 fought.
John J. Pershing.
General MacArthur Comander in Chief US Army Far East Comand, he wrote a letter to a congressman that rediculled Truman's policy so Truman fired him.