Does anyone know if/how one can sign up to volunteer on an Operation Thirst truck prior to the show? Does Operation Thirst even still exist?

In the past I've always ducked in the trailer and signed up for a shift when onsite. But this year I'll be limited to just a couple days. But I like volunteering in this way (give back a little, see a LOT of the field). I seem to recall a couple years ago they moved Operation Thirst under a food service or or similar.

Thanks in advance!