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."
Grandchild: "Why are Grandpa's hands so stiff and sore?"
Father: " 'Cuz he spent his life fighting in wars so you won't have to."
Grandpa: "Shut up, boy, you'll make him into a pussy."
Father: "Give me a break, Pop, I want him to be a steely-eyed missile man just like you."