Tuhia he tomokanga mō tēnei wāhanga - I uru a Eglin ki te Indiana National Guard i te tau 1911 i a ia e ako ana i te Whare Wānanga o Wabash, ā, i tīmata i te mahi kāwanatanga i te marama o Hune 1916, i te rohe o Amerika ki Mexico
He aha? I te tau 1917, i whakauruhia ia ki te Kaitiaki o Indiana i muri i te urunga mai o te United States ki te Pakanga Tuatahi o te Ao, a i tukuna ia ki te whakangungu paerata. I muri i tana whiwhinga hei paerata me tana komihana i te Wahanga Aviation, U.S. Signal Corps, i noho tonu a Eglin ki te kura hei kaiwhakaako rere. I whakawhiwhia a Eglin ki tetahi komihana auau i roto i te Ratonga Rererangi i te Hurae 1, 1920 ka whakahau i etahi roopu i te United States me te Philippines.