 Nyorai kupfuurira kweiyi ndima - Grange akagadzwa somukuru wemauto muDecember 1969. Grange akatanga kuona chiito chakakosha chekurwa semutevedzeri wechipiri akagadzwa ku101st Airbornes Lima Ranger kambani muI Corps Tactical Zone yeVietnam muna 1970. Iri boka raive chikamu che75th Infantry Ranger uye rakasungirirwa ku2 17th Cavalry. Somutungamiri wekutanga achishumira rwendo rwechipiri muVietnam kubva muna 1971 kusvika muna 1972, Grange akanga ari chipangamazano kuHondo yeRepublic of Vietnam Airborne Division. Grange akapiwa mibairo yakawanda yeSilver Star nokuda kwegamba muVietnam kusanganisira mubairo wake wechitatu nokuda kwehutano mukuita muna February 1972 paaishumira neU.S. Airborne Advisory Detachment. Grange akadzokera kuFort Bragg muna 1972 uye akashanda ne3rd Battalion, 5th Special Forces Group semukuru mukuru wevashandi uye mutungamiri wevashandi kusvika muna 1974. Gore iroro, Grange akapedza kudzidziswa kubhururuka uye akazoshanda ne158th Aviation Brigade. Kubva muna Chikunguru 1978 kusvika muna 1980, Grange akashanda semutungamiri wekambani yevatambi, C Company, 1st Ranger Battalion, 75th Ranger Regiment, iyo yakatsigira Operation Eagle Claw muna Kubvumbi 1980. Muna 1981 Grange akapedza British SAS Course kuHereford, England ndokuzoenda kuMarine Corps Command uye Staff College. Muna 1982, Grange akazvipira uye akagamuchira basa ku1st Special Forces Operational Detachment Delta 1st SFOD-D, kana Delta Force kuFort Bragg, North Carolina. Grange akatungamira B Squadron panguva yekupinda kweGrenada muna Gumiguru 1983 ichiteverwa nebasa semukuru wevashandi veyuniti. Muna 1987 Grange akazvipira kushanda muSouth Korea uye akatora mutungamiri we1st Battalion, 503rd Infantry Regiment, 2nd Infantry Division kusvika muna 1988. Akabva apiwa basa rokuva mukuru mukuru wemabasa chaiwo neSpecial Operations Command, Washington, D.C. muna 1989. Grange akapinda National War College ndokudzokera kuFort Bragg muna June 1990 semutevedzeri wemutungamiriri weDelta Force, mubasa iro akatungamira boka rebasa panguva yeDesert Storm. 