A NASA astronaut or engineer who quickly devises an ingenious solution to a tough problem while under extreme pressure.

When you eat dirt for the first time and leave your family to build a shack in the woods

A man's man. Especially a military man who is willing to place himself in harm's way for the good of his unit or its mission. Also, any man who weighs his own desires and aspirations against the needs and welfare of others less powerful than himself. Any male, protective provider capable of violence against those who would harm the weak, but not overly quick to "bring it."