Tuhia he tomokanga mō tēnei wāhanga - I te pakarutanga o te Pakanga Paniora-Amerika, ka uru atu a Upton ki te ope taua o Amerika. I mahi ia hei tangata takitahi i roto i te Kamupene H o te 2nd Oregon Volunteer Infantry Regiment ka uru ki te hopu i a Guam me nga kaupapa Philippines
He aha? I noho tonu a Upton ki te Kaitiaki Motu o Oregon i muri o te pakanga. I te tau 1911, i mahi ia hei kaitiaki matua o te 3rd Regiment o Oregon Infantry.