When did the Pentagon change the designation of the Korean ‘Conflict’ to the Korean ‘War’?

June 25, 1950
On June 25, 1950, the Korean War began when some 75,000 soldiers from the North Korean People's Army poured across the 38th parallel, the boundary between the Soviet-backed Democratic People's Republic of Korea to the north and the pro-Western Republic of Korea to the south.
Korean War - HISTORY
www.history.com/topics/korea/korean-war
Found by www.google.com/search?q=when+did+korean+conflict+change+to+korean+war