[4] During the Spanish–American War Coe served at Key West Barracks, Florida, where his unit was responsible for the defense of the U.S. Atlantic Fleet.

[6] In the years immediately prior to World War I he served as Del Rio, Texas during the Pancho Villa Expedition, and in San Francisco, California on the staff of the Army's Western Department.

[9] He was succeeded by his brother in law, Brigadier General William Chamberlaine, as commander of the Railway Artillery Reserve.

[11] The citation for his Army DSM reads: The President of the United States of America, authorized by Act of Congress, July 9, 1918, takes pleasure in presenting the Army Distinguished Service Medal to Major General Frank Winston Coe, United States Army, for exceptionally meritorious and distinguished services to the Government of the United States, in a duty of great responsibility during World War I, in the reorganization of the Coast Artillery, thereby enabling it to meet the great demand for overseas artillery.

He died at Walter Reed Army Medical Center on May 25, 1947[15] after several years of ill health and complications brought on by a broken hip.