Since as early as 1870, there has been a Professor of Military Science at Delaware College. Following a suspension of military instruction between 1875 and 1885, the Army officially established a Military Department, with 1LT George Leroy Brown as the first Professor of Military Science. In 1890, the number of cadets included four seniors, six juniors, nineteen sophomores, fifty-two freshmen, seventy-six sub freshmen, and one special student. As a result, when the Spanish-American War came, the Cadet Corps was well organized and its members proved valuable in preparing the Delaware Militia for its part in the conflict. Many of the undergraduates volunteered for service, and a few who obtained commissions remained in the Regular Army and served as officers in World War I.
Delaware College entered upon its academic year 1918-1919 mainly as an adjunct to the United States Army. Officially, it was known as Number 351 Student Army Training Corps, with every physically fit undergraduate a member of the Army, clad in uniform and entitled to pay.