The Congressional Budget Office is working to analyze why the Defense Department's operations and maintenance budget continues to grow, despite a concurrent decrease in the size of the U.S. military force structure. Spending on O&M increased 47 percent between 2000 and 2012, or $63 billion after removing the effects of inflation, according to a July 1 CBO slide presentation given by Derek Trunkey of the National Security Division and released online. The two largest contributors to O&M growth were the...