Prior to joining the Scarborough Police Department, Mark was a 24-year veteran of the Maine State Police where he retired in November 2021 at the rank of Lieutenant. During his 24-year career, He served for 12 years with Troop A in Alfred conducting rural patrol in York County and 12 years in the Major Crimes Unit in Gray where he was promoted to Lieutenant in 2017 and finished the final year of his career as the Troop Commander at Troop A.
Chief Holmquist's distinguished career includes his service as First Sergeant from the US Army Reserves in December 2021. He served for 25 years in the US Army, Maine Army National Guard and US Army Reserves. The highlight of his military career was his service as a Sentinel at the Tomb of the Unknown Soldier in Arlington National Cemetery from 1992-1993. The majority of Chief Holmquist's Army Reserve service was in the role of Senior Drill Sergeant, assigned to a training unit specifically tasked to turn citizens into Soldiers during basic combat training.