Department of Defense's Office of the Inspector General released a report Thursday saying the Pentagon has failed to take advantage of 58 open recommendations to save money, and could save $33.6 billion if it followed these recommendations.

"We urge the DoD to focus additional attention on implementing these open recommendations," said Bruce Anderson, a spokesman for Department of Defense Office of the Inspector General. "Timely implementation of agreed-upon corrective actions is critical for the DoD to improve the efficiency and effectiveness of its programs and operations."

The biggest money-saver is a recommendation from 2013 that said increased procurement of the CH-53K helicopter was "not justified," and that $22.2 billion could still be saved by reducing this procurement item.

The report listed 1,298 open recommendations made to the Pentagon in prior audits and evaluations issued since April 2006, and spotlights 30 open recommendations that would provide the greatest cost savings to the DoD.

The Office of the Inspector General says the Pentagon has agreed to take "corrective actions" on 1,251 of the 1,298 open recommendations.