 Nyorai kupfuurira kweiyi ndima - basa raWallroth mukati mezvemashoko eSweden rakatanga muna 1971. Akaenda kuSweden Defence University muna 1975 uye akasimudzirwa kuva colonel muna 1977 uye mukuru colonel muna 1978. Wallroth akanga ari mukuru weboka rezvemauto ehurumende nehutano hwehutano, seMutungamiri weDefense Staffs Operation Section 5 Chef Försvarsstabens operationssektion 5, CFst Op5 kubva muna 1978 kusvika muna 1982. Akagadzwa kuita mukuru weJoint Operations Command Operationsledningen, OPL muna 1982 uye akasimudzirwa kuva mukuru mukuru muna 1984 uye aive mukuru weInternational Division pa Ministry of Defence kubva muna 1984 kusvika muna 1989. Hondo Yemashoko nezviitiko zvechikepe chepasi pegungwa cheSweden zvinotora chikamu chikuru choupenyu hwezuva nezuva, pamwe chete nokuzvipira kweSweden kune dzimwe nyika, kusanganisira mauto okuchengetedza rugare eUnited Nations. Wallroth akanga ari mukuru mukuru uye mutungamiriri weNational Defence Radio Establishment kubva muna 1989 kusvika muna 1994, makore anoshamisa apo Chibvumirano cheWarsaw chakaparara, Soviet Union yakawauye vaSoviet vakabva muBaltics. 