For the third time, the Marine Corps Air-Ground Combat Center in Twentynine Palms received an award for its conservation efforts. The Secretary of the Navy Environmental Awards recognized the Combat Center Monday for its efforts in advocating environmental responsibility, its contributions in environmental areas, for protecting natural resources, and sustainability. Winners are selected by environmental experts from the government and private sectors, who evaluate the Marine Corps and Navy nominations. Once that is complete, one Navy winner and one Marine Corps winner is awarded in each category and then submitted to compete in the Secretary of Defense Environmental Awards competition. The Combat Center was also presented with the award in 2010 and 2011.