It sounds like sometimes it might go overnight. Family is one thing, but how do rescue volunteers arrange for this with their paying jobs? What kind of demographics are these rescuers?
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We were a fairly varied lot, ranging from teenagers to "mature." About 20-25% female. Obviously, it helps if your work situation can tolerate your absence. I found an obscure clause in our personnel manual that allowed up to forty hours administrative leave for public service of this type; sometimes I took vacation time. Eventually I finagled a schedule where I worked four ten hour days, taking the weekends and Mondays off. Some of our personnel had positions at the University of Arizona; quite a few worked for a local engineering firm that accommodated their interest. We had both MD's and RN's in our group. Obviously there are job situations that can't or won't compromise on the flexibility that is so useful in SAR.
While a fair number of use were competent in technical rescue, rock climbing, and all that, not all of us were, or needed to be. One thing I learned is that many people lacking superior outdoor ability could contribute, before, during, and after operations in all kinds of ways. I don't believe that any of us were available 100%of the time - I had a project that took me out of town during the summer most years I was active Our rescue group did not require mandatory attendance - you did what you could and participated when possible. You were a member as long as you paid your annual dues.
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Bingley, your employer just might surprise you. Don't be discouraged by initial skepticism, but when you show continued activity, and, especially,leaving a comfortable workplace to do battle with the elements, you are likely to garner support and assistance. You are making a valid contribution to a better community and that is a win-win all around.