Former U.S. Navy Commander Zoe Dunning (L), and former USMC Staff Sgt. Eric Alva, Nancy Pelosi with President Obama at the signing. Photos by Patsy Lynch. Final photo courtesy White House Media Affairs Office.

Former U.S. Navy Commander Zoe Dunning (L), and former USMC Staff Sgt. Eric Alva, Nancy Pelosi with President Obama at the signing. Photos by Patsy Lynch. Final photo courtesy White House Media Affairs Office.

Former U.S. Navy Commander Zoe Dunning (L), and former USMC Staff Sgt. Eric Alva, Nancy Pelosi with President Obama at the signing. Photos by Patsy Lynch. Final photo courtesy White House Media Affairs Office.