Walkersville's "Special Operations" unit is Ambulance 246. It is a 1995 International N4700/Horton that previously ran as Ambulance 248. In 2015, the department decided that instead of retiring the ambulance, they would convert it to a bariatric unit, used to transport obese patients. It is used throughout Frederick County when such a need arises.
2015 work on the ambulance included extensive work by department members, PL Custom modified some of the interior as well as miscellaneous work (i.e. addition of a winch), and a new paint job was provided by Damascus Motors and lettering/graphics by Shannon-Baum Signs.