The rot in the US military, and in other institutions, is much greater than hiring the wrong individuals, so it won't be fixed by hiring and firing individuals. That may restore a certain amount of functionality and dignity to the affected institutions, but it won't solve the core problem. It's fundamentally about bloated budgets, parasitic contracts, malinvestment (pouring billions into programs that are of dubious benefit to the public, technologies that are outdated, etc etc etc), overextension across the globe combined with lack of domestic security, unwinnable wars and delusional belief in victory (especially when defeat is beyond obvious and guaranteed by now— Taiwan vs China, Israel vs Iran, Ukraine vs Russia, and on and on).
Same thing with the rot in the finance sector. The fact that they openly hire mediocrities according to racial quotas is not helping them of course, but they were descending into oblivion long before they instituted those programs in the 2010s— so eliminating them will not prevent the ship from sinking. There it's also about fundamentally wrong ideas: namely, printing up trillions of dollars and distributing the fake money only to the rich. This project has created perverse incentives for corporations, who now have government subsidized growth without having to do any work, dramatically increased wealth inequality (and destabilized America), while also accomplishing nothing— we're now headed into a financial crisis worse than 2008, suffer from sky-high inflation, and everyone is downwardly mobile. Replacing idiot DEI hires with high IQ competent people will not, in and of itself, change things because the incentives and internal structure and focus of these institutions has been compromised.
This is like obsessively cleaning the kitchen, while the house burns down.
In general, I think the aim of the future populist movement, or whatever successor movement arises to pick up the pieces of America, will have to be eliminating all of this accumulated toxic waste in the various institutions. Some of them will have to be shut down permanently, while others will only heal through purges, cutting jobs, slashing budgets, and so on. We may even need to make whole new ones, while abandoning the existing ones, given that they're incapable of delivering the goods.