While you may have a good idea, that's an awfully dangerous line of thinking because it allows someone to define the "NEED." Especially when that someone can give more "free" stuff out with that money and not be held responsible when it comes back to haunt us. Threats by their very nature are speculative. Why do we "NEED" a conventional defense force today other than playing "world police" and "nation building"? Are Canada and Mexico ready to invade? Are the Chinese going to float 20 million men across the Pacific? We certainly don't "NEED" to be in Afghanistan, Iraq, Africa, Europe, and Asia. Lets pull back our fleet and scrap it. Just keep a few ICBM's online and call it a day. That logic sounds awfully familiar to another once great empire...
I never suggested that, but ever heard of WWII? Certainly there were other factors, but worldwide it was the biggest and arguably most successful "stimulus" ever.