Greece sent an expeditionary unit consisting of an infantry battalion and an air squadron. Their experience in mountain warfare proved especially valuable for operating in the rugged terrain of the Korean Peninsula.
The UN Greek Battalion participated in numerous important battles, including Outpost Harry, one of the most intense of the war. Its staunch defense of strategic positions was crucial for the Allies.
Greek participation strengthened its integration with the Western bloc during the Cold War and left a legacy of brotherhood with South Korea, reflected today in stable bilateral relations.
Source: es.wikipedia.org/wiki/Participación_de_Grecia_en_la_Guerra_de_Corea