A new Pentagon analysis of U.S. military bases and facilities estimates that one-third of U.S. Army and Air Force infrastructure will be unneeded by 2019, wasting resources at a time of tight budgets, a military spokesman said on Friday.

The analysis found the U.S. Defense Department overall had an excess infrastructure capacity of 22 percent, U.S. Navy Capt. Jeff Davis, a Pentagon spokesman, told a briefing. The estimate of surplus capacity was based on force levels that the department expects to have by the 2019 fiscal year.

"We must close military bases to avoid spending money on bases we don't need," Davis told the briefing.