From Wikipedia

Korea The Forgotten War

In the US, the war officially was a police action (a Korean Conflict, not a Korean War) owing to the lack of a legitimate declaration of war by the US Congress. Colloquially, it is also The Forgotten War and The Unknown War, because it ended in stalemate, and unlike the Second World War and the Vietnam War, it is sometimes considered culturally forgotten.

The term Korean War also denotes the skirmishes before the invasion and since the armistice.

Korean War
Part of the Cold War
Clockwise, from top: The US Army at the 38th parallel; F-86 Sabre fighter aeroplane in Korean combat; Incheon harbour, starting point of the Battle of Inchon; Chinese soldiers welcomed home; 1st. Lt. Baldomero Lopez, USMC, over the top of the the Incheon seawall.
Date 25 June 1950—present Ceasefire signed 27 July 1953 Location Korean Peninsula Result Inconclusive Cease-fire armistice North Korean invasion of South Korea repelled US–UN invasion of North Korea repelled Korean Demilitarized Zone (DMZ) established, little territorial change at the 38th parallel border, essentially uti possidetis Technically, at war. Territorial changes DMZ; both gained little border territory at the 38th parallel.
Belligerents
United Nations (UN Resolution 84):  Republic of Korea  United States  United Kingdom  Australia  Belgium  Canada  Colombia Ethiopia France Greece  Luxembourg  Netherlands  New Zealand  Philippines South Africa  Thailand  Turkey Naval Support and Military Servicing/Repairs:  Japan Medical staff:  Denmark  Italy  Norway  India  Sweden	North Korea and Allies: Democratic People's Republic of Korea People's Republic of China  Soviet Union Medical staff: Czechoslovakia[1]
Commanders
Syngman Rhee Chung Il-kwon Paik Sun-yup Douglas MacArthur Matthew Ridgway Mark Wayne Clark Harry S. Truman Dwight D. Eisenhower George VI Elizabeth II Elpidio Quirino Fidel V. Ramos Tahsin Yazıcı	Kim Il-sung Choi Yong-kun Kim Chaek Mao Zedong Peng Dehuai Joseph Stalin Georgy Malenkov
Strength
590,911 480,000 63,000 26,791 17,000 7,430 5,455 3,972 3,421 2,163 1,389 1,294 1,271 1,068 900 826 44 Total: 1,207,010	260,000 926,000 26,000 Total: 1,212,000 Note: The figures vary by source; peak unit-strength varied during war.
Casualties and losses
South Korea 137,899 KIA 450,742 WIA 32,838 MIA/POW United States 36,516 dead (2,830 non-combat) 92,134 wounded 8,176 MIA 7,245 POW United Kingdom 1,109 dead 2,674 wounded 1,060 MIA or POW Turkey 721 dead 2,111 wounded 168 MIA 216 POW Canada 516 dead 1,042 wounded Australia 339 dead 1,200 wounded France 300 KIA or MIA Greece 194 KIA 459 wounded Philippines 112 KIA Netherlands 123 KIA Belgium 106 KIA New Zealand 33 KIA South Africa 28 KIA and 8 MIA Luxembourg 2 KIA Total: 778,053	North Korea: 215,000 dead, 303,000 wounded, 120,000 MIA or POW China (Chinese estimate): 114,000 killed in combat 34,000 non-combat deaths 380,000 wounded 21,400 POW (U.S. estimate): 400,000+ dead 486,000 wounded 21,000 POW Soviet Union: 282 dead Total: 1,187,682-1,545,822
Total civilians killed/wounded: 2.5 Million (est.) South Korea: 990,968 373,599 killed 229,625 wounded 387,744 abducted/missing North Korea: 1,550,000 (est.)