As a network engineer how do I volunteer to help with communication systems during disasters?

I'm a network engineer who wants to help out during major disasters. Most major providers will send crews to try and keep lines of communication up and running during large disasters. A few of my colleagues helped out during Katrina, but they worked for larger companies at the time. I am confident my work will allow me to leave for an extended period to volunteer I'm just not sure how I get started.

I've looked into groups like IBEW and Red Cross. IBEW seems like its more a Union/Lobbyist group, but I could be wrong it's not clear how to get involved in their disaster recovery wing, and the Red Cross wants local disaster recovery (which I have signed up for) but I want to be on the ground in the worst areas. I don't even have to be doing telecom focused work I just want to be on the ground in the thick of it helping however I can.