I think this was more of a deciding factor than his IQ:
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As a former employer, I can agree 100% with this.
That said, what intelligent person would want to be in a career where your chances to come home in a body bag are exponentially high?
One who wants to help others, make a difference, and serve the community making it a better place to live. Oh and the pensions are pretty nice too.
Why should a smart person be denied this opportunity because they might get bored?