Would this action be military insubordination or disobeying unlawful orders?

For context, a Terran WMD detonated in a Martian battlefield (it's complicated), and the 'Hiroshima' retaliation / strategic show of force to avoid a protracted war involves dropping two asteroids on the American continent. My protagonist in focus has a crisis of conscience battling under the asteroids approaching Earth, and gives up on fighting.

The asteroids impact Earth and kill tens of millions anyway.

Would this be insubordination or disobeying unlawful orders? And while we're on the...

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