McIntyre entered the United States army as a second lieutenant in the 19th Infantry, serving in various ranks until he attained that of brigadier-general in 1912.
 He saw duty at different posts, chiefly on the Mexican border, until the war with Spain, in which he participated in the Puerto Rico Campaign in 1898.
McIntyre served in the Philippines from 1899 to 1902, after which he served with the general staff.

McIntyre was attached to the Bureau of Insular Affairs in 1905 and became its Chief in 1912, relieving General Clarence Ransom Edwards.
 During the War in Europe, he was assistant chief of staff with the rank of major-general.
McIntyre served as long-time Chief of the Bureau of Insular Affairs and played a significant role in the governance of the Philippines and Puerto Rico throughout this period.
With respect to Puerto Rico, McIntyre wavered on the wisdom of granting United States citizenship to Puerto Ricans but ultimately supported the Jones–Shafroth Act of 1917.
At times, McIntyre had strained relations with other officials in Puerto Rico, such as U.S. District Judge and fellow Alabama nativePeter J. Hamilton during the 1910s and Governor E. Mont Reily during the 1920s.
In his 2007 book Planting the American Flag: Twelve Men Who Expanded the United States Overseas, author Peter C. Stuart devoted an entire chapter to the career of Gen. McIntyre and his leadership of the Bureau of Insular Affairs.
With respect to McIntyre's administration of the Philippines  and Puerto Rico, Stuart noted " While others more assertive or egoistic imprinted on the protectorates their personal marks, McIntyre left no memorial....yet he wielded perhaps greater sway upon the United States' little empire than all his more visible imperial colleagues."
Stuart credits Gen. McIntyre's stewardship over the Bureau of Insular Affairs as having been critical to its survival, and noting that within a decade following his retirement the Bureau was turned over to the Department of the Interior and disbanded in 1939.
Reflecting upon the Bureau's demise, Stuart noted "An era of American imperial administration--in many ways the McIntyre era--had ended."

McIntyre retired from the Army in 1929.
McIntyre entered the United States army as a second lieutenant in the 19th Infantry, serving in various ranks until he attained that of brigadier-general in 1912.  He saw duty at different posts, chiefly on the Mexican border, until the war with Spain, in which he participated in the Puerto Rico Campaign in 1898. McIntyre served in the Philippines from 1899 to 1902, after which he served with the general staff.
McIntyre was attached to the Bureau of Insular Affairs in 1905 and became its Chief in 1912, relieving General Clarence Ransom Edwards.  During the War in Europe, he was assistant chief of staff with the rank of major-general. McIntyre served as long-time Chief of the Bureau of Insular Affairs and played a significant role in the governance of the Philippines and Puerto Rico throughout this period. With respect to Puerto Rico, McIntyre wavered on the wisdom of granting United States citizenship to Puerto Ricans but ultimately supported the Jones–Shafroth Act of 1917. At times, McIntyre had strained relations with other officials in Puerto Rico, such as U.S. District Judge and fellow Alabama nativePeter J. Hamilton during the 1910s and Governor E. Mont Reily during the 1920s. In his 2007 book Planting the American Flag: Twelve Men Who Expanded the United States Overseas, author Peter C. Stuart devoted an entire chapter to the career of Gen. McIntyre and his leadership of the Bureau of Insular Affairs. With respect to McIntyre's administration of the Philippines  and Puerto Rico, Stuart noted " While others more assertive or egoistic imprinted on the protectorates their personal marks, McIntyre left no memorial....yet he wielded perhaps greater sway upon the United States' little empire than all his more visible imperial colleagues." Stuart credits Gen. McIntyre's stewardship over the Bureau of Insular Affairs as having been critical to its survival, and noting that within a decade following his retirement the Bureau was turned over to the Department of the Interior and disbanded in 1939. Reflecting upon the Bureau's demise, Stuart noted "An era of American imperial administration--in many ways the McIntyre era--had ended."
McIntyre retired from the Army in 1929.
Frank McIntyre