Nulis lanjutan pikeun paragraf ieu - 2 silsilah CER sacara resmi ditelusur ka 4th Field Company (4 Fd Coy) Royal Australian Engineers, anu diangkat dina tahap awal Perang Dunya I. Direname 7th Field Company (7 Fd Coy) dina taun 1915, unit ieu kasohor jasa na di Perancis sareng Bélgia dina Patempuran Somme, Menin Road sareng dina Garis Hindenburg. Salila Perang Dunya II, 7 Fd Coy ngalawan Jepang di Kokoda
jeung di Bougainville.