Conrad returned to the United States in the summer of 1902. He served with Troop A at
Fort Assinniboine,
Montana from August 1902 to June 1903. From June to October 1903 he served at
Fort Yellowstone,
Wyoming, after which he returned to Fort Assinniboine. He was on detached duty as adjutant of the Jefferson Guard at the
Louisiana Purchase Exposition in
St. Louis from April 1904 to March 1905. He then returned to Fort Assinniboine, where he remained until November 1905. From December 1905 to April 1907, Conrad served with the 5th Cavalry at
Fort Stotsenburg, Philippines. He served in
Leyte, Philippines during an expedition against the
Pulahan from April to July 1907, after which he returned to Camp Stotsenburg. From February to June 1908, Conrad served with the 5th Cavalry at Fort Clark, Texas. From June to August 1908 he served with his regiment on the Texas-Mexico border, after which he returned to Fort Clark. From April to October 1909, Conrad served in the office of the Army's
Quartermaster General. He then returned to Fort Clark, where he served with the 5th Cavalry until March 1910. From March 1910 to May 1913, Conrad served at
Front Royal, Virginia, where he established a
remount depot and started a department that oversaw the breeding of
Cavalry horses. As a member of the
15th Cavalry, Conrad served at
Fort Sheridan, Illinois, then at a Cavalry camp of instruction in
Winchester, Virginia. The 15th Cavalry moved to
Fort Bliss, Texas in November 1913, where it performed security duty on the Texas-Mexico border until August 1915. In August 1915, Conrad transferred to the
8th Cavalry. He then attended the School of
Equitation at the
Fort Riley,
Kansas Mounted Service School. After graduation in May 1916, he returned to Fort Bliss. In July 1916 he was promoted to major in the 3rd Cavalry. During the
Pancho Villa Expedition, Conrad served on the Texas–Mexico border as an advisor to federalized
National Guard units. He served at
Camp Wilson, Texas, as an advisor to the 1st Alabama Cavalry from December 1916 to March 1917. He then returned to duty with the 3rd Cavalry at
Fort Sam Houston, Texas, where he remained until August 1917. In July 1917, Conrad was promoted to
lieutenant colonel. ==World War I==