Every one of those arguments applies for military spending. How many people has the GI bill put through college? How many people do companies like Honeywell, Raytheon, and Boeing employ?
Do you think we buy our ICBMs, our jets, our air craft carriers, our soldiers, et al from China or something?
Besides, our military is the economic grease in the world. International shipping of goods and petroleum would be a completely different story without our navy.