He entered West Point in 1870 and graduated 17 June 1874, joining the 7th Cavalry later that year.

During the June 1876 expedition to the Little Bighorn River, Lieutenant Hare was on detached service assisting Lt. Charles Varnum with the Indian scouts, being appointed assistant on the evening of the 24th of June.

Hare later gave testimony at the subsequent Reno Court of Inquiry in 1879.

Hare participated in the Nez Perce War (1877), Spanish–American War, and Philippine American War, notably in the recovery of captured US forces following the Battle of Pulang Lupa.Hare was awarded two Silver Star (medal)s and cited "for gallantry in action against insurgent forces at San Jacinto, Luzon, P. I., Nov. 11, 1899," and again "for gallantry in action in the pursuit of superior forces of the enemy under the insurgent General Tinio in Northern Luzon, P. I., Dec. 4‑18, 1899, through a most dangerous and difficult country, through hardships and exposure, thereby forcing the enemy to liberate 22 American prisoners held by him, Dec. 18, 1899.

"[1] He also commanded U.S. forces on the island of Marinduque, where he instated a policy of civilian internment.