I was in a similar situation as a SAR volunteer, which often conflicted with work, where I also took annual leave, frequently just a few hours at a time. I was able to tweak my work schedule so that i worked four days a week, ten hours a day, which allowed me to have the weekend and Mondays free. There definitely can be conflicts with home and family obligations, and often it was impossible to get away from work. That is why you need a fairly large group of volunteers.

My teenage daughter began to object to my SAR work, because I missed some of her activities. That disappeared when I spent a Christmas Day and the following night searching (successfully) for one of her classmates during a heavy winter storm. As long as I kept things in balance, my employer saw SAR work as community service and therefore a good thing. My ex-wife never did think much of the program.....

You just have to strike a balance and make adjustments, like parting ways with the wife. That will differ with every situation and circumstance.