Another theory is that some smart people already know better, and they know they're going to waste many millions of dollars investigating its feasibility, but they've been given an order from Whiskey Pete and have to at least go through the motions of writing a study/detailed report on why it's not possible to reactivate in a reasonable amount of time or budget. Never underestimate how often the US military will send a group of subordinate people to do what is effectively busy-work.