Was he doing both simultaneously? Typically the demands of one branch of public safety require you to leave the other. Fire fighting and law enforcement are both physically demanding. I find it highly doubtful that someone could do full time shifts in both branches of public safety simultaneously. Also keep in mind that public safety has mandatory overtime for both civilian and commissioned employees. Leaving one branch for the other is no big deal, but working both?
Nope, he stopped being a firefighter when he began the Sheriff's Deputy training.