Qualified people in the defense department probably wouldn't even try to conquer Greenland.
Probably not. But 4-5 "qualified" Secretaries of Defense spent trillions of dollars and 20 years to replace the Taliban with the Taliban. Wars in Afghanistan have been famously unwinnable for over 2,000 years. And none of those men were exactly Alexander the Great.
It was also JFK's "Best and Brightest" who decided war with Vietnam was a good idea.
None of this is a defense of Hegseth, a drunk who said, "I will only stop drinking if you put me in charge of the entire military". Maybe the most alcoholic statement of all time.