BAGHDAD - With attention focused on the seven soldiers charged with abuse at the Abu Ghraib prison, U.S. military and intelligence officials familiar with the situation tell NBC News the Army’s elite Delta Force is now the subject of a Pentagon inspector general investigation into abuse against detainees. The target is a top-secret site near Baghdad’s airport. The battlefield interrogation facility known as the “BIF” is pictured in satellite photos. According to two top U.S. government sources, it is the scene of the most egregious violations of the Geneva Conventions in all of Iraq’s prisons. A place where the normal...