It is a volunteer organization that is the official Air Force Auxilary and performs missions as directed by the Air Force. These missions include:
Search and Rescue
Homeland Defense
Counterdrug
Misc missions such as delivery of vital organs, etc.
They have a program for cadets and senior members. My squadron actually has more senior members than cadets. Things to consider before joining:
1. Not every squadron has an assigned plane. Those that don't have an airplane mainly focus on the cadet program. If you are interested in flying, find and join a squadron that has an assigned aircraft.
2. As stated by others, the cadet program is only as good as those who are running it. Talk to some of the cadets and ask them how they like the management.
Benefits of CAP membership:
1. If you are a pilot and like to fly, you can get a lot of flying time in. If you are qualified and fly CAP missions the flying time is free. CAP aircraft are also available for [b]MEMBERS[/b] to fly at a reduced hourly rate ($45-50 an hour), with certain limitations, when they are not being used for missions.
2. For motivated teens, sucessfull progression in the cadet program can benefit them in a few ways. If you get promoted to a certain level you can later join the military at a higher grade (E-3). Exceptional cadets can even get a direct appointment to the Air Force academy.
For years, the CAPs bread and butter was search and rescue and they still do quite a lot of this. Recently the counterdrug and homeland security missions were added. Counterdrug missions involve flying around and searching for plots of "whacky tobaccy" and vectoring LEO units on the ground into the location. Homeland security is mostly looking for and reporting suspicious activity around damns, pipelines, power stations, and border areas.
Hope this helps.