honored in a timely manner. 3. Duplicate medals The Secretary may strike and sell duplicates in bronze of the gold medal struck pursuant to section 2 under such regulations as the Secretary may prescribe, at a price sufficient to cover the cost thereof, including labor, materials, dies, use of machinery, and overhead expenses. 4. National medals Medals struck pursuant to this Act are national medals for the purposes of chapter 51 of title 31, United States Code.