CAP does search and rescue, but it depends on the region. Some areas are very busy, some are not so busy. To participate in the search/rescue/recovery efforts, you have to get certified to do the tasks. Re-reading the thread, I see CAP1 has a link where you can find the local units.
I went on one search when I was in CAP, but I had just joined so I ended up marshaling aircraft on the ramp. Easy enough to learn and it was nice to help out even if it was something the pilots probably could have figured out themselves if they had to. But for a pilot at the end of his third 3-hour search grid mission, I guess it was nice to have some kid tell him where to park so his plane would get gassed up and he could get some coffee without him having to think about it very much.
We were also "hired" by local airshow organizers to help out with crowd control. You'd be surprised at how willing people are to take instructions from a 14 yr old simply because he's wearing a sharp looking uniform, but it worked great keeping people off of the active flight line and away from spinning props and other dangerous areas.
At age 17, you may be more interested in the "adult" functions of the CAP more than the cadet stuff. I don't know the age limits and all that (check with the local CAP squadrons) but at the very least you might manage to get checked out as a spotter or a ground search party member.