The DOD's budget is much more of a sacred cow than the Dept of Education's, Lockheed Martin is much better at lobbying than Pearsons. Plus, entrenched interests like CoreCivic are actively lobbying against effective education as it creates a cash cow down the line for them.
> The DOD's budget is much more of a sacred cow than the Dept of Education's
Well, the Department of Defense is an actual constitutional branch of the executive, whereas there is nothing whatsoever in the Constitution which grants the United States authority over the education policies of the several states.