 Ramba uchinyora ndima iyi - Haislip akashanda muVera Cruz, Mexico, muna 1914 pashure peTampico Affair. Kubva muna 1917 kusvika muna 1921, akashanda neAmerican Expeditionary Forces, kutanga muHondo Yenyika I, ndokuzoita basa muGermany. Munguva yaaive mhiri kwemakungwa mabasa ake aisanganisira kuve paGeneral Staff yeV Corps; Division Machine Gun Officer ye3rd Division, uye General Staff, U.S. Mauto kuGerman. MuHondo Yenyika I akapinda muhondo yeSaint-Mihiel uye Meuse-Argonne Offensive. Akadzokera kuWest Point somurayiridzi kubva muna 1921 kusvika muna 1923. Akazoenda kuzvikoro zvakasiyana-siyana, kutanga neU.S. Army Infantry School kubva muna 1923 kusvika muna 1924, akazoenda kuCommand and General Staff School kubva muna 1924 kusvika muna 1925, uye pakupedzisira akadzokera mhiri kwemakungwa kunopinda French École supérieure de guerre kubva muna 1925 kusvika muna 1927. Akadzokera kuUnited States semubatsiri mukuru muhofisi yeMutevedzeri Munyori weHondo kubva muna 1928 kusvika muna 1931, achiteverwa neArmy War College kubva muna 1931 kusvika muna 1932, uye basa semurairidzi kuCommand and General Staff School kubva muna 1932 kusvika muna 1936. 