Does anybody have any knowledge on finding deployments CONUS/OCONUS and how to volunteer for them?

I have heard of IA (individual augmentee) positions for certain deployments, but from my understanding that is when a unit requests someone (not specific) from a specialized unit to come on the deployment. Is it possible for active duty soldiers to volunteer to deploy? I know around Fort Bragg specifically there is a lot of trading that can take place prior to a deployment. Is there an official way to make yourself available or is it all just who you know at the right time? ***EDIT*** I am active duty, so the programs for the Guard and Reserve will most likely not help.