I think we knew this

The U.S. Department of Defense sees urban schools as ones of its biggest recruiting obstacles. Not because leftist teachers in some of those schools try to keep recruiters out, but because so many potential recruits have to be turned down because of the poor education they have received in those schools. While only 21 percent of Americans live in rural areas, 44 percent of the qualified recruits come from these areas. What’s strange about all this is that the rural areas spend much less, per pupil, on education, but get much better results. Part of this can be attributed to differences in cost of living, but a lot of it has to do with simply getting more done with less. Per capita, young people in rural areas are 22 percent more likely to join the army, than those of the same age in urban areas.