Answer:
1) North Korea initially used a Blitzkrieg strategy, relying on speed and surprise to gain advantage over the South Korean forces. They also used guerrilla tactics, relying on small, mobile forces to harass the South Korean and UN forces. Finally, they adopted a defensive strategy, relying on static positions and heavy fortifications to protect their advances.
2) South Korea initially used a defensive strategy, relying on static positions to protect their territory and utilize their air power. Later, as the UN forces gained a foothold in Korea, South Korean forces relied heavily on air and ground assaults to make gains.
3) The US military strategies during the Korean War included air superiority, heavy use of artillery, a naval blockade of North Korea, and a slow, methodical advance along the western coast of the Korean peninsula. Additionally, the US utilized large numbers of soldiers and soldiers to launch a series of counter offensives, such as the Incheon Landing and the Battle of Heartbreak Ridge, to regain lost territory and push the North Korean forces back.