MENTION THE KOREAN WAR and almost immediately it evokes the memory of Marines at Pusan, Inchon, Chosin Reservoir, or the Punchbowl. Americans everywhere remember the Marine Corps' combat readiness, courage, and military skills that were largely responsible for the success of these early operations in 1950-1951 .          BY: LIEUTENANT COLONEL PAT MEID, USMCR and MAJOR JAMES M. YINGLING, USMC