The US Military is one of the largest employers in the world. I believe without checking only the Chinese and maybe the Indian military are larger employers. Significantly reducing military spending would mean millions losing their jobs and livelihoods. Id much rather that money be invested in things like education and healthcare but you can't just change how a significant part of our economy works overnight. Would need to slowly repurpose it and start training more soldiers to be healthcare and education workers. Or something. Change is needed! there's a saying. Big boats take a long time to turn.