Pedzisa mutsara unotevera: Akagoverwa ku21st Infantry Regiment, McAndrew akashanda pakutanga kumadokero kweUnited States, uye akatora chikamu muHondo yeGhost Dance kurwisa Sioux muna 1890<unk>1891. Akakwidziridzwa kuva lieutenant wokutanga muna 1894, uye akapiwa 3rd Infantry. McAndrew akashanda muCuba munguva yeHondo yeSpain neAmerica, uye akatora chikamu mu
Hondo yeEl Caney uye Kukombwa kweSantiago. Muna 1899, McAndrew akasimudzirwa kuva kaputeni, uye akashanda muPhilippines panguva yePhilippine-American War. Kubva muna 1905 kusvika muna 1906, akashanda ne3rd Infantry muSkagway, Alaska.