The 22 of June is when he joined
When Japan fell during the Second World War, Korea was suddenly free, and hoped to finally be able to decide the fate of their own country. Most Koreans campaigned for a unified state.
However, the United States and the Soviet Union had different ideas. The Soviets wanted to expand the sphere of communist influence into Korea. The United States countered by encouraging the establishment of democracy. Additionally, the United States stressed the importance of containment, which is a foreign policy used to prevent the spread of communism.
This disagreement would eventually lead to the Korean War. The Korean War was the first battle of the Cold War, and first major proxy war fought between the United States and a Soviet communist supported enemy. A proxy war occurs when one or more opposing powers instigates a war and then uses third parties to fight on their behalf.
Sources such as diaries though not very reliable can be used if there are a large amount of them showing the same date and event. Historical books written about the event especially those closer to the time would be able to help determine that the date is accurate as well.
