Rees was initially assigned to the
3rd Infantry Regiment, and he continued to serve with his regiment in the Philippines. In February 1902, he led the effort that recovered the bodies of five soldiers from the 35th U.S. Volunteer Infantry, who had been ambushed in 1900 while providing an escort for a pro-U.S. local leader. After returning to the United States in 1903, he was posted to Kentucky, stationed first at
Fort Thomas and later at
West Point. Following his service in Kentucky, Rees was assigned to duty in
Alaska Territory, where he initially served at
Fort Liscum, then at
Fort Egbert. In June 1907, Rees was assigned to
Fort Columbia, Washington, where he served as an instructor for joint army and National Guard coastal defense exercises. In the summer of 1908, he commanded Company H, 3rd Infantry during a temporary camp near
Tacoma, Washington, where army units conducted extensive maneuvers and exercises to gain proficiency with Field Artillery gunnery and Infantry and Cavalry attacks and defenses. After returning to Fort Columbia later that year, he served as
adjutant of the 3rd Infantry. In September 1909, Rees returned to the Philippines, where he served with the 3rd Infantry on the island of
Jolo. In May 1912, Rees was posted to
Fort Leavenworth, Kansas, where he was a student in the Army School of the Line. He completed the course in 1913, and was named a distinguished graduate. ==Continued career==