14 U.S.C. § 2740
Insignia for additional awards
No more than one Coast Guard cross, distinguished service medal, silver star medal, distinguished flying cross, or Coast Guard medal shall be issued to any one individual; but for each succeeding deed or service sufficient to justify the awarding of a Coast Guard cross, distinguished service medal, silver star medal, distinguished flying cross, or Coast Guard medal, the President may award a suitable emblem or insignia to be worn with the decoration and a corresponding rosette or other device.