When Did Yonkers Stop Marking Rigs as "Y.F.D." ?

[61MACKBR1 222]

Does anyone know when the Yonkers Fire Department ceased marking their Rigs with the ensignia marking of Y.F.D. (as they did in the past [ie: 1950's, 1960's]). Does anyone know what was the LAST Yonkers F.D. rig to have the markings Y.F.D. and not just simply "Yonkers Fire Department" or "Yonkers F.D."?

[Guest x901]

The four 1998 Smeal Engines (4, 7, 10 & 12) say YFD on the sides