Amazing new jobs & technology will flow from a new American space industry focused initially on establishing a moon base, colonizing Mars, exploring our solar system, and probing deep space!
In addition to growing our economy exponentially, developing the new technologies necessary will lead to lighter & stronger materials, new propulsion systems, environmental advances, computing breakthroughs, anti-gravity & shielding technology, and eventually faster-than-light travel with warp drives and/or star gates!
Tripling NASA's budget from the paltry $18B to $55B by reducing the core Defense budget of $550B by the difference is a small price to pay for an investment that could easily be paid off with the first gold or diamond encrusted asteroid we're able to capture and mine!