A NASA astronaut or engineer who quickly devises an ingenious solution to a tough problem while under extreme pressure.
"Houston, the CO2 level has dropped to nine."
"That is good to hear, Aquarius. And you, sir, are a steely-eyed missile man!"
-Apollo 13 movie dialogue
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."