When was Hap Arnold appointed as a second lieutenant?

Hap Arnold was appointed as a second lieutenant on June 14th, 1907, which marks a significant point in his military career. This date is important as it represents the beginning of his journey in the U.S. Army, where he would later rise through the ranks to become a key figure in the establishment and expansion of the U.S. Air Force. His early appointment signifies his entry into military service, which ultimately led to numerous achievements and innovations in aviation and military strategy. Understanding this timeline helps students appreciate Arnold's contributions to military aviation and the historical context of his career.