Pedzisa mutsara unotevera: Muna 1929, Groves akaenda kuNicaragua achitungamirira boka re1st Engineers sorutivi rworwendo rwaiva nechinangwa chokuongorora Inter-Oceanic Nicaragua Canal. Kutevera
1931 kudengenyeka kwenyika kweNicaragua, Groves akatora mutoro weManagua's water supply system, iyo yaakapihwa iyo Nicaraguan Presidential Medal of Merit. Groves akasimudzirwa kuva kaputeni musi wa20 Gumiguru 1934. Akapinda Chikoro cheCommand and General Staff kuFort Leavenworth, Kansas, muna 1935 na1936, mushure mezvo akatumirwa kuKansas City, Missouri, semubatsiri kumukuru weMissouri River Division. Muna 1938 na1939 akapinda Army War College. Pana 1 July 1939, akaendeswa kuWar Department General Staff muWashington, D.C.