Kammala wannan jumla: A watan Maris na 1944, Simpson ya kasance tare da Landing Force a cikin 3rd Marine Division kuma ya shiga cikin
Saukowa a Emirau, wanda bai hadu da juriya ba. An ba shi mukamin Laftanar Kanal a watan Afrilu 1944 kuma an umurce shi da ya koma Amurka wata daya daga baya. Bayan dawowarsa zuwa jihohi, an umurci Simpson da ya halarci karatun Sojoji a Kwalejin Kwamandan da Ma'aikata a Fort Leavenworth, Kansas kuma ya kammala karatunsa a watan Nuwamba na wannan shekarar.