The Marine Corps Expeditionary Medal is a military award of the United States Marine Corps which was established on 8 May 1919. Originally known as the Marine Corps Expeditionary Ribbon, a full-sized medal was authorized on 1 March 1921 by Presidential Order of Warren G. Harding. The Marine Corps Expeditionary Medal is therefore one of the oldest medals of the United States military which is still issued to active duty personnel.
To be awarded the Marine Corps Expeditionary Medal, personnel must have engaged in a landing on foreign territory, participated in combat operations against an opposing force, or must have participated in a designated operation for which no other service medal is authorized. After 1961, some commands permitted eligible personnel to choose between the Marine Corps Expeditionary Medal, or the Armed Forces Expeditionary Medal, depending on the nature of the operation in question.
The medal was designed by Walker Hancock and feature's a 1920's era marine in full combat gear, advancing, bayonet at the ready, with the word "Expeditions". The reverse is the same as that of the Marine Corps Dominican Campaign Medal.