In April of 2015, AZDPS Director Frank Milstead promoted Dean Chase from the Rank of Sergeant to Captain and assigned him as the District Nine, Highway Patrol Division Commander, located in Sierra Vista. During his 17 years as an Arizona State Trooper, Captain Chase served in full-time, or temporary positions in the Highway Patrol Division, the Agency Support Division, and the Criminal Investigations Division.
Captain Chase started his career with the department as a trooper in the remote duty station in Sanders. Captain Chase later transferred to the White Mountains and served in the Show Low Squad. During his time as a Trooper, he served as a Recruit Training Officer for ALEA Class #400 and he served a temporary assignment in the Navajo County Narcotics Task Force. He also served as a Drug Recognition Expert, and he also trained new troopers as a Field Training Instructor.
In 2007, he was promoted to the rank of Sergeant, and was assigned to supervise the Asset Forfeiture Unit. As a sergeant, he also held positions as a district administrative sergeant, and as a highway patrol road squad sergeant for the Holbrook, Sanders, and Heber squads.
Prior to being hired by AZDPS, Captain Chase served seven years with the Army National Guard in a field artillery unit before being honorable discharged in 1996. Captain Chase graduated from the Arizona Law Enforcement Academy Class #332. Captain Chase is also a graduate from the West Point Leadership in Police Organization (LPO) Command program, and the Rural Executive Management Institute Leadership program.