Pedzisa mutsara unotevera: Pashure pomuganhu, McClure akanga ari muPuerto Rico kubva muna 1899 kusvika muna 1900, ipapo akabatira muPhilippines kubva muna 1901 kusvika muna 1903. McClure akava mudzidzi akatanhamara weChikoro cheMutsara muna 1909, uye akapedza kudzidza kubva kuArmy Staff College muna 1910. Akava murayiridzi paChikoro cheMasoja kubva muna 1913 kusvika muna 1916. Munguva yechirimo cha1916, akabatanidzwa mu
Pancho Villa Expedition. Muna 1917, McClure akapedza kudzidza kuUnited States Army War College uye akasimudzirwa kuva Brigadier General musi waDecember 17 wegore iroro. Akanga ari mutungamiriri weBase Camp Number One muSan Nazaire, France, kusvikira muna 1918. McClure akabva ava mutungamiri we69th Infantry Brigade kwemwedzi miviri, uye akazotungamira 38th Infantry Division kwemavhiki mashanu. McClure akapedza mwedzi mitatu ari muhondo pamwe chete ne69th ne38th Divisions. McClure akashanda muhofisi yaChief of Staff muWashington kubva pakupera kwa1918 kusvika kutanga kwa1919. Kubva muna 1920 kusvika muna 1922, akashanda semubatsiri wemukuru weDisciplinary Barracks paFort Leavenworth, Kansas uye kubva muna 1923 kusvika muna 1926 akashanda neSignal Corps. McClure akarega basa sa colonel musi wa 21 Chikunguru 1929, uye chinzvimbo chake cheBrigadier General chakadzorerwa muna Chikumi 1930.