The Marine Corps Expeditionary Medal is a decoration of the United States Marine Corps which was first created on 8 May 1919. Originally known as the Marine Corps Expeditionary Ribbon, a full-sized medal was authorized in July 1921 by Presidential Order of Warren G. Harding. The Marine Corps Expeditionary Medal is therefore one of the oldest decorations of the United States military which is still issued to active duty personnel. The United States Navy equivalent of the Marine Corps Expeditionary Medal is known as the Navy Expeditionary Medal.