Arnold mụrụ na Gainesville, Florida, nke mbụ n'ime ụmụ ise nke U.S. Army Major Albert C. "AC" Arnold na onye bụbu Irene Dominick Onye njem dị anya, AC Arnold lụrụ ọgụ na Agha Boer n'akụkụ ndị Boers; sonyeere ndị agha nke asaa dị ka onye agha; bụ onye na-agba chaa chaa n'osimiri; lụrụ ọgụ n'akụkụ Brigadier General John J. Pershing na Mexico Punitive Expedition
; e nyere ya ihe nrite nke Distinguished Service Cross maka ihe ndị o mere na 1/326 Infantry na Château-Thierry n'oge Agha Worldwa Mbụ; gara ụlọ akwụkwọ iwu; e kenyekwara ya n'ọkwa dị iche iche na ndị agha n'oge udo tupu ọ laghachi na Seventh na Fort Lewis, Washington, ebe ọ nwụrụ na 1932.