Does free college threaten our all-volunteer military? That is what Benjamin Luxenberg, on the military blog War on the Rocks says. Unlike nearly every other developed country, which offer free or low cost higher education ... in America you need money to go to college. Right now there are only a handful of paths to higher education in America: have well-to-do parents; be low-income and smart to qualify for financial aid, take on crippling debt, or ... join the military. Overall, 75 percent of those who enlisted or who sought an officer's commission said they did so to obtain educational benefits. And in that vein, Luxenberg raises the question: If college was cheaper, would they still enlist? It is a practical question worth asking, but raises more serious issues. Do tuition costs need to stay high to help keep the ranks filled? Does unequal access to college help sustain our national defense? A single F-35 fighter plane costs $178 million. Dropping just one plane from inventory generates 3,358 years of college money. We could pass on buying a handful of the planes, and a lot of people who now find college out of reach could go to school. The defense budget is some $607 billion, already the world's largest by far. The cost of providing broader access to higher education would be a tiny fraction of that amount, far below any threshold where a danger to America's defense could be reasonably argued.