That particular 'study' quote came from Chuck Hagel about a month before President Obama fired him.  

"WASHINGTON — Defense Secretary Chuck Hagel resigned under pressure on Monday after President Obama determined that he had to shake up his national security team in the face of escalating conflicts overseas and hawkish Republicans reasserting themselves on Capitol Hill.
It was a striking reversal for a president who chose Mr. Hagel two years ago in part to limit the power of Pentagon officials who had repeatedly pushed for more troops in Afghanistan and a slower drawdown of American forces from Iraq."

The entire report basically is a 'The military has to be prepared for anything." summary.