Mezue ahịrịokwu na-esonụ: Na 18 Mee 1898 Craig ghọrọ onye isi ndị agha nke 20 nke Kansas Infantry, na-aga n'ihu na onye isi na afọ na-esote. N'oge na-adịghị anya mgbe a napụtasịrị ya n'ụzọ nsọpụrụ na 12 June 1899, a họpụtara ya ọzọ dị ka onye isi nke 36th United States Volunteer Infantry, ebe o jere ozi ruo mgbe a kpọpụtara ya n'ụzọ nsọpụrụ na 16 Machị 1901. A họpụtara Craig ka ọ bụrụ onye isi ndị agha nke abụọ nke Artillery Corps na 8 Mee 1901, bulie ya elu ka ọ bụrụ onye isi ndị agha na 28 Julaị 1903 ma bulie ya ọzọ ka ọ bụrụ onye isi, oge a nke Fourth Field Artillery Brigade, na 25 Jenụwarị 1907. N'oge a, Craig jere ozi na Philippines n'agbata afọ 1898 na 1901 nakwa n'agbata afọ 1904 na 1907. Craig mesịrị jee ozi na Mexico na Veracruz (1914) na
Njem ịta ahụhụ megide Pancho Villa (1916). Mgbe o jesịrị ozi na Mexico, Craig ghọrọ akụkụ nke General Staff Corps na 25 Nov 1916, na-arụ ọrụ dị ka onye isi ndị ọrụ nke 12th Infantry Division ruo mgbe ọ ghọrọ osote onye isi ndị ọrụ nke Ngalaba Ndịda na 24 Machị 1917. O mechara bụrụ akụkụ nke War College Division dị ka General Staff na Washington, D.C., site na Eprel ruo June 1917, n'oge nke a kwalitere ya ịbụ onye isi na 15 Mee 1917. N'ọnwa Ọgọstụ afọ 1917, ọ gara France dị ka onye ọchịagha na ndị agha mba. N'oge Agha Iwa Mbụ, Craig jere ozi dị ka onye isi ndị ọrụ nke ndị agha dị iche iche nke ndị agha, n'ikpeazụ ghọọ brigadier general na October 1918. Ọ duziri 302nd Regimented Field Artillery, 151st Brigade, 76th Division na 157th Field Artillery Brigade na 1918 na mgbe e mesịrị 158th, 2nd na 5th Field Artillery Brigades na 1919. N'ihi ọrụ ya n'oge agha ahụ, Craig natara U.S. Distinguished Service Medal na French Silver Plaque.