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How can i explain? He works for a major (like, one of the biggest ones) military contractor; he's an electrical engineer.
Let's say a military tank, fighter jet, or aircraft carrier (or various other things like that) break down. He (and his team) write computer code that is hooked up to the on-board computers of the tank or jet or whatever, and their code determines what's wrong with the damn thing. Basically, diagnostic software that fixes it. So occasionally, he's flown out to an aircraft carrier, or the military rolls a tank into the plant, or they haul in a jet, and he makes sure the stuff they programmed fixes the problems it needed to, or if it needs tweaking.
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