Hank Castillon was born in Rock Springs, Wyoming and graduated from Lincoln High School with the class of 1963 in Green River. Hank lettered in track all four years and in football and basketball for three years. He earned an associate of arts degree in Accounting, bachelor of science degrees in Business Management and Business Administration, and a master's degree in Public Administration.
His military education includes Field Artillery Wireman, Radio Repairman, Officers Candidate School, Field Artillery Officer, Jungle Operations, Army Command and General Staff College, National Defense University National Security, U.S. Army War College, National Interagency Counternarcotics Institute, and the California Specialized Training Institutes' Emergency Management Course.
He began his military career in the Wyoming Army National Guard with training until he was called to active duty in December of 1969 and was assigned to Fort Carson, Colorado as Assistant Executive Officer and then Executive Officer. He was then transferred to the Republic of Vietnam and was assigned as Executive Officer to the Battery C 6th Battalion 29th Field Artillery, 4th Infantry Division. After his tour in Vietnam, he was assigned to Leonard Wood, Missouri. He was released from active duty in January 1970 and rejoined the Wyoming Army National Guard. In July 1984, General Castillon assumed command of the 115th Field Artillery Brigade. Upon completion of this command tour, he was assigned as Director of Personal Headquarters State Area Command, Wyoming Army Nation Guard. He was then reassigned as Post Commander of Camp Guernsey, Wyoming. After attending the US War College, he served for two years as Deputy State Area Commander and Headquarters State Area Command for the Wyoming Army Nation Guard. He became Assistant Adjutant General in May 1992 and received federal recognition as Brigadier General in March 1993 and then retired in 1998.
He has received numerous awards and decorations in the military including the Silver Star, Legion of Merit, Bronze Star Medal with "V" Device for Valor with one Oak Leaf Cluster, Purple Heart, Meritorious Service Medal, Air Medal, Army Commendation Medal, Army Reserve Components Achievement Medal, National Defense Service Medal, Vietnam Service Medal, The Armed Forces Reserve Medal with two hour glass devices, Army Service Ribbon, Army Overseas Ribbon, Army Reserve Components Overseas Training Ribbon with Numeral 2, Republic of Vietnam Campaign Medal, and the Combat Infantryman badge.
Hank was appointed by Secretary of the Selective Service as Wyoming's Selective Service Director. He resigned to accept a position with the Department of Interior (Bureau of Land Management) and worked for the department for 13 years before retiring in June of 2009. He also was elected to serve as a School Board of Trustees member for School District Number Two and served two-four year terms. He has also served on the City of Green River Board of Adjustments, Southwest Counseling Service, University of Wyoming-Minority Students Advisory Committee, and Governor's Task Force Committee for the 2000 Census, National Guard Bureau, and National Guards Western Region Board.
Hank was elected Mayor for the City of Green River in 2006.