Sounds like a self-starter!
The only thing wrong with this is that he didn’t get permission beforehand. Had the target been designated “high-value”, a drone-strike (or more) would be valid options.
He violated the bureaucracy. No one got to “order” him to do it. And for that he must be punished. That is the sole difference.
I don’t know whether to laugh or cry.
That’s the question, asked in today’s terms as.....Would you have killed Hitler in 1936, if you had had the opportunity, knowing what you know now, you murderer?