From 2005 to 2006, Hou served in Iraq as a senior field surgeon for Echo Company, 50th Main Support Battalion, 42nd Infantry Division, New Jersey Army National Guard, where she performed routine and advanced emergency medical care for coalition soldiers and Iraqi civilians and maintained medical readiness for mass casualty trauma.
In 2011, Brig. Gen. Hou served in Afghanistan as the Field Surgeon for Charlie Company, 700th Brigade Support Battalion, 45th Infantry Brigade Combat Team. She was the sole medical provider on an Afghanistan National Army base and was responsible for providing routine and advanced emergency medical care in the combat theater for more than 600 coalition soldiers, contractors, and foreign nationals.
Since 2013, Brig. Gen. Hou has also served as the Region II representative for the National Guard Bureau (NGB) Medical Advisory Group and, from 2018 to 2020, she served as the Chair of the Army National Guard Credentials Certification and Privileging Preparation Board. In August 2020, she became the chair of the nationwide Army National Guard Medical Advisory Group.
In February 2024, Hou was promoted to major general.[10] In July 2024, she was assigned as Director of the Office of the Joint Surgeon General at the National Guard Bureau.[2]