The sums are vast, but the explanations for the spending range from vague to inscrutable. Consider these items in the law that funded the Department of Defense this year: For “Other Procurement, Air Force”: $32.6 billion. For “Research, Development, Test and Evaluation, Defense-Wide”: $35.2 billion. And for “supplies and associated support services” related to U.S. Code Title 10 Section 3601 subsection(c)(3)(B) clauses (i) through (iv): a mere $650 million. Determining what, exactly, all this public money is paying for requires cross-referencing thousands of pages of financial tables, accounting records and congressional committee documents that will leave all but the most determined budgeting sleuth at a loss. Yet this is how the U.S. government explains its funding decisions for the most expensive military in the world. And the cost is growing. “There’s no way that you can follow the money, because it keeps getting twisted like a Rubik’s Cube,” said John Ferrari, a retired Army major general and now a nonresident  senior fellow at the American Enterprise Institute. “None of it is set up to be …