Reserve Firefighters The Fire Department is fortunate to have many paid on-call firefighters. Of these, three are experienced lieutenants L to R:  Dexter Upton and Denis de Clercq who have extensive experience in firefighting and emergency response experience. Dexter Upton has been a volunteer with the CCSD Fire Department since 1969, and is currently a reserve Lieutenant. For the past 30 years he has also been a volunteer crew member with the Cambria Community Healthcare District. Denis de Clercq has been an on-call firefighter for the CCSD Fire Department since 2000 when the San Luis Obispo County and CCSD Fire Departments combined their volunteer firefighting forces. Prior to his work with the CCSD, he was a 20-year reservist for the SLO County/CDF. Johathan Gibson - to follow   .