The Defense Distinguished Service medal is awarded to military officers for exceptionally meritorious service while assigned to a Department of Defense joint activity.
The intention of the award is to recognize only the most senior officers of the United States Military who have direct contact with the Secretary of Defense and other senior officials and whose assignment was over a sustained period, typically over 12 months.
Defense Distinguished Service Medal
Precedence and Devices
The Defense Distinguished Service Medal is worn after the military crosses, and Before the Distinguished Service medals of each branch of the United States military.
The "C" device is awarded to indicate the inital award (for combat conditions occuring on or after January 7, 2016) may be worn, and placed to the wearer's right when worn with Arabic numerals or oak leaf clusters.
When the total of devices is more than four, numerals are worn to show the number of awards.