See Army Regulation 600-8-22, Military Awards.
Battle clasps were awarded for each of the major operations for individuals actually present under competent orders. The clasps, with a star on each side of the name of the campaign or one of the defensive sectors, were worn on the suspension ribbon for the following campaigns:
- Cambrai: 20 May - 4 Dec 1917
- Somme Defensive: 21 Mar - 6 Apr 1918
- Lys: 9 Apr - 27 Apr 1918
- Aisne: 27 May - 5 Jun 1918
- Montdidier-Noyon: 9 Jun - 13 Jun 1918
- Champagne-Marne: 18 Jul - 6 Aug 1918
- Aisne-Marne: 18 Jul - 6 Aug 1918
- Somme Offensive: 8 Aug - 11 Nov 1918
- Oise-Aisne: 18 Aug - 11 Nov 1918
- Ypres-Lys: 19 Aug - 11 Nov 1918
- St. Mihiel: 12-16 Sep 1918
- Meuse-Argonne: 26 Sep - 11 Nov 1918
- Vittorio-Veneto: 24 Oct - 4 Nov 1918
- Defense SectorÂ
Clasps were awarded to personnel who served overseas in one of the following areas and were not entitled to a battle clasp:
- England: 6 Apr 1917 - 11 Nov 1918
- France: 6 Apr 1917 - 11 Nov 1918
- Italy: 6 Apr 1917 - 11 Nov 1918
- Siberia: Any service in Siberia
- Russia: Any service in European Russia
The lapel button is bronze, except that personnel who were wounded in action were awarded a silver lapel button.