Kammala jumla mai zuwa: 2 An gano asalin CER a hukumance zuwa 4th Field Company (4 Fd Coy) Royal Australian Engineers, wanda aka tashe shi a farkon matakan Yaƙin Duniya na I. An sake masa suna 7th Field Company (7 Fd Coy) a 1915, an san wannan rukunin ne saboda hidimarsa a Faransa da Belgium a Yaƙin Somme, Menin Road da kan Hindenburg Line. A lokacin yakin duniya na biyu, 7 Fd Coy ya yi yaƙi da Jafananci a
Kokoda da kuma Bougainville.