Assistant Chiefs are listed below in order of their appointment to PFD by date, not when they assumed the Assistant Chief rank. The rank existed from the first day of the department's organization in 1890 and lasted until 1912.
The rank reappeared on April 1, 1961 (not a recognized civil service rank and thus required no exam). It was first offered to Joseph Dayspring who declined. It then went to Walter Titus and Daniel Carroll. Joseph Dayspring later (1962) reconsidered and accepted the rank. Many others followed over time. The rank was eliminated in 1980.