What? GP's claim is that hair provides a similar benefit. VA is simply not testing heads with hair on them -- their tests can't "show otherwise" (your claim).

> GP's claim is that hair provides a similar benefit.

GP provides no evidence for that. VA Tech not addressing it (if it's true that they don't - I have no reason to believe it) is not evidence. VA Tech also doesn't address my theory that microscopic super-intelligent aliens affect helmet response.