What is kpa?

Some articles on kpa:

Korean War - Course of The War - China Intervenes (October – December 1950)
... On 27 June 1950, two days after the KPA invaded and three months before the Chinese entered the war, President Truman dispatched the United States Seventh Fleet to the Taiwan Strait, to prevent hostilities ... On 15 October, after moderate KPA resistance, the 7th Cavalry Regiment and Charlie Company, 70th Tank Battalion captured Namchonjam city ... intervention in Korea, and that the PRC's opportunity for aiding the KPA had lapsed ...