Dee ihe ga-aga n'ihu maka paragraf a - Eglin sonyere ndị Indiana National Guard na 1911 mgbe ọ bụ nwa akwụkwọ na Wabash College, wee bido ọrụ gọọmentị etiti na June 1916, na-eje ozi na oke ala US na Mexico
Ọ dị mma. N'afọ 1917, e nyere ya ọrụ na ndị nche Indiana mgbe United States banyere Agha Worldwa Mbụ ma kenye ya ọzụzụ ịnya ụgbọelu. Mgbe Eglin nwetasịrị akara ya dị ka onye ọkwọ ụgbọelu na ọrụ na Ngalaba Aviation, US Signal Corps, ọ nọgidere n'ụlọ akwụkwọ ahụ dị ka onye nkuzi na-efe efe. Eglin natara ọrụ oge niile na Ọrụ Ikuku na July 1, 1920 wee nye iwu ọtụtụ ndị agha na United States na Philippines.