A silver color metal and enamel device 1 5/32 inches (2.94 cm) in height overall consisting of a silver cross couped, bearing an oak tree on a mound proper all above a maroon scroll bearing the motto "EVACUARE" in silver letters.
The silver cross represents the activities of the Medical Corps, and the oak tree represents the service of the organization in the Meuse-Argonne Offensive during World War I.
The distinctive unit insignia was originally approved for the 15th Evacuation Hospital on 5 February 1942. It was redesignated for the 15th Combat Support Hospital on 8 March 1974. It was redesignated for the 15th Evacuation Hospital on 22 October 1984. The insignia was redesignated effective 16 September 1993, for the 115th Field Hospital, with description revised.