The families of Navy SEAL Team 6 members killed in a disastrous August 2011 helicopter crash in Afghanistan blamed the government for the tragedy, during an emotional press conference. Speaking at the National Press Club, [they] claimed President Obama turned the SEALs group into a Taliban target after the administration revealed they had conducted the bin Laden raid. Doug Hamburger, whose son Patrick was killed, called the incident an ambush" that could have been prevented. "We're very concerned that the administration had disclosed that the Navy SEALs had carried out a successful attack on bin Laden's compound resulting in his death. Never before in the history of our county (had) a sitting president released that type of information to the public," Hamburger said. In all, 38 people died that night after the chopper was shot down by a Taliban-owned rocket-propelled grenade -or RPG - over the Wardak Province on Aug. 6, 2011. Charles Strange, whose son Michael, 25, died in the attack said Obama personally promised him a thorough investigation of what happened but has failed to deliver. Strange also blamed top military brass for sending the troops into a situation they were allegedly ill-equipped and unprepared to handle. Karen Vaughn says she wants to know why her son Aaron and his team were not using special operations aircraft. The night her son Aaron died, he was in a helicopter that was built in the 1960s and last retrofitted in 1985.