Kammala jumla mai zuwa: A 1929, Groves ya tashi zuwa Nicaragua a cikin jagorancin wani kamfani na 1st Engineers a matsayin wani ɓangare na wani bincike wanda manufarsa ita ce gudanar da binciken don Canal na Nicaragua na Inter-Oceanic. Bayan da
Girgizar kasa ta Nicaragua a shekarar 1931, Groves ya dauki nauyin tsarin samar da ruwa na Managua, wanda aka ba shi lambar yabo ta shugaban kasa ta Nicaragua. An gabatar da Groves zuwa kyaftin a ranar 20 ga Oktoba 1934. Ya halarci Makarantar Kwamandan da Janar a Fort Leavenworth, Kansas, a cikin 1935 da 1936, bayan haka aka tura shi zuwa Kansas City, Missouri, a matsayin mataimakin kwamandan kwamandan Missouri River Division. A cikin 1938 da 1939 ya halarci Kwalejin Yaƙin Soja. A ranar 1 ga Yuli, 1939, an tura shi zuwa Babban Jami'in Ma'aikatar War a Washington, DC.