This guy calls into Garrison's Radio show and wants to cut defense spending to solve our deficit problem. Garrison asks him what percent of the budget is spent on defense, and he doesn't even know. Not even a guess. So that's problem number 1. People suggesting a solution when they have no idea what they are talking about.
Here is a link that might help you:
Defense as a percent of GDP
Defense spending is actually going down as a percent of GDP - Depending on the time period, or going up on shorter time periods. Percent of GDP is what I think you should look at, that is at ~5%. Either way as a percent of the budget, its about 20% depending on whose number you choose to believe, but he couldn't get that close, and this is his plan.
So then he says, he just wants "intelligent government spending". THAT DOESN'T EXIST! People need to stop believing the lie that the the government and intelligent spending could ever go together. But even if you cut 100% of defense spending, it would still solve the deficit problem! So do all of the people who act as a proponent of that solution know, it could never be the answer.
The real unfortunate truth is there is no way to balance the budget without cutting entitlement spending, which has climbed from 2.5% of GDP to 10% of GDP (or 25% by some sources). That is 2 times that of defense spending.