Hey
I found a company that sells helmet strap retention systems and I thought I'd pass it along. They look pretty promising with some of the ideas they have, so I thought I'd pass it along to the rest of the community.
This is one of the videos of their products:
YouTube - Milspecmonkey.com Shotshow 2007 Ops-Core
And here's the website:
http://www.ops-core.com/index.cfm