A series EE savings bond which was introduced by the U.S. Treasury Department in December 11, 2001, three months after the September 11 attacks. It was issued in support of the country’s war effort though its proceeds go to the government’s general fund. This bond accrues interest that is paid when a holder cashes in the bond or on maturity date. Interest on patriot bonds is free of state and local taxes.

However, the only difference between EE and a patriot bond is the legend PATRIOT BOND printed in capital letters between the social security number of the owner and the issuance date.