Scout troops are always a good source of volunteers. You might also want to tap into local organizations such as American Legion, VFW, schools, etc. There's lots of volunteer organizations out there that enjoy these type of opportunities.

On the ham radio front, contact some local radio stations. Chances are some of their folks are also amatuer Ham radio operators. You might also want to reach out to Ft. Hood (in Killeen, TX). A wealth of volunteers and also potential Ham radio operators. (Contact the Army Community Service on post and they should be able to give you contacts).

Good luck. You'll do great.