Korean Service Medal

The Korean Service Medal (KSM) is a military award for service in the United States Armed Forces and was established November 8, 1950 by executive order of President Harry Truman. The Korean Service Medal is the primary US military award for service or participation in operations in the Korean area between June 27, 1950 and July 27, 1954.
Medal devices.
Service stars.
The United States Department of Defense declared thirteen official campaigns of the Korean War, all of which are annotated by service stars on the Korean Service Medal. Some campaigns apply to all branches of the US military, while others are branch specific. The Korean Service Medal is authorized a 3/16" bronze or silver (indicates five campaigns) service star to denote participation in any of the following campaigns:
Arrowhead device.
An arrowhead device is authorized for US Army or Air Force personnel to denote participation in each of the following:
History.
Although the Korean War Armistice ended combat operations in Korea on 27 July 1953, the Korean Service Medal was issued until June 1954 due to the tense nature of the occupation and garrison duty immediately after the armistice, as well as the high possibility of a renewed attack by North Korea. After 1954, the Korean Service Medal was no longer issued although the Armed Forces Expeditionary Medal was authorized for Korean area service between October 1, 1966 to June 30, 1974. As of 2004, a new medal known as the Korea Defense Service Medal was authorized for members of the armed forces who served in the defense of the Republic of Korea from July 28, 1954 to a date to be determined.
The KSM was designed by the Army Heraldic Section. The color scheme of the ribbon is derived from the Flag of the United Nations, as it was under the auspices of the United Nations (United Nations Security Council Resolution 82) that the war was conducted. The medal itself features a "Korean gateway," most likely an iljumun, on the front, and a taegeuk on the reverse. 
The United Nations Service Medal for Korea was usually issued alongside the Korean Service Medal. Beginning in 1999, the Republic of Korea War Service Medal was also awarded to United States service members who received the Korean Service Medal. The Republic of Korea Presidential Unit Citation is retroactively authorized to any United States Army veteran who served in Korea during the War.