This medal is awarded for any active duty service period completed between 8 Sep 39 and 7 Dec 41, if the active duty order specified service for a 12-month period or longer. A Foreign Service Clasp is attached to the ribbon and medal if the same requirements are met and the service was performed outside the continental United States (CONUS).
The medal is 1 ¼ inches in diameter, bearing in front an armed figure symbolic of defense under the inscription "American Defense." The ribbon is basically yellow, with blue, white, and red stripes right to left and left to right symmetrically near the edges. Authorized Device: Service Star