NBC News anchor Brian Williams is taking heat after admitting Wednesday that a rocket-propelled grenade did not bring down a helicopter he had been aboard while reporting in Iraq, despite having told the story repeatedly since 2003. “I would not have chosen to make this mistake,” Williams told Stars and Stripes in a statement. “I don’t know what screwed up in my mind that caused me to conflate one aircraft with another.” Despite a subsequent on-air apology during last night’s broadcast of NBC Nightly News, many viewers took to the web to voice their skepticism at Williams’ claim that he...