Plot Hole: "Why did NASA train oil drillers how to be astronauts when they could’ve just trained astrounats to drill oil in Armageddon (1998)?"

Explanation: "NASA and other space agencies do this all the time; they’re called mission specialists and they have specialized training in some field the flight crew doesn’t. They don’t get taught how to fly the ship, just how not to die in space.

Also, for the record, drilling for oil — or any kind of deep core geological work — is extremely specialized, and most of the people in the positions the team of drillers in Armageddon were in have a lot of letters behind their names."