In August 1918 he deployed to France during World War I, until October of that year in which he was transferred to the 143rd Field Artillery Regiment stationed out of Camp de Souge.
On January 18, 1919, Coane was honorably discharged from active service and appointed a second lieutenant to the California National Guard as a field artillery officer.
[1] On March 17, 1942, months after the onset of World War II, then Colonel Coane was temporarily promoted to Brigadier General, and assigned as artillery commander of 41st Infantry Division, based out of Fort Lewis.
He would deploy with the unit to the Pacific Theater, participating in the Battle of Roosevelt Ridge with the 162nd Infantry Regiment.
[4] In 1977, at age 86, Coane passed away and was buried at Redondo Beach, Los Angeles County, California.