On the morning of 25 June 1950, the peace in South Korea was shattered by the sound of invading tanks. The North Korean army had crossed the 38th parallel and were driving south towards the South Korean capital of Seoul in an effort to unite the country under Communist rule. The United States Air Force, weakened by post-World War II demobilization, associated budget reductions, and preoccupied with the threat of the Soviet Union, was thrust into its first war as a separate service when North Korea invaded South Korea.