USPS Purple Heart Forever Stamps - Sheet of 20 Self-stick sheet of 20 forever stamps Stamps feature the Purple Heart Medal. Background may be yellow or white. Forever stamps are always equal in value to the current First-Class Mail one-ounce rate The Purple Heart is awarded in the name of the President of the United States to members of the U.S. military who have been wounded or killed in action Valid as USPS postage on any mailing