The Defense Department is investigating reports that Marine Corps members posted hundreds and perhaps thousands of nude photos of their female comrades on social media. Thewarhorse.org, a non-partisan web site that serves military members and veterans, first reported the incidents March 4. The organization contends that more than two dozen female Marines, identified by their names and ranks, had their nude pictures posted on a private Facebook page. The account has since been deleted. Gen. Robert Neller, the Marine Corps commandant, reacted sternly and strongly to the report. “It’s embarrassing to the Corps, to our families and to the nation. If changes need to be made, they will be made,” Neller said, in an online article published March 7 by Seapower magazine.