On June 7, 2002, the U.S. Postal Service issued the Heroes of 2001 semi-postal stamp.
The difference between the sales price and the underlying First-Class Mail rate constitutes a contribution to provide assistance to the families of the emergency relief personnel killed or permanently disabled in the line of duty in connection with terrorist attacks on September 11, 2001. It is the second semi-postal stamp the Postal Service has issued – the first being the Breast Cancer Research.