NBC Nightly News anchor Brian Williams said on Wednesday he was sorry for "making a mistake" when he said he was on a helicopter that was hit and forced down by rocket fire during the 2003 invasion of Iraq, after soldiers complained it was **t true. Williams made the claim on his broadcast last Friday while reporting a tribute at a New York Rangers hockey game for a retired soldier who provided ground security during the incident. Williams said he and his news crew were protected by a mechanized platoon from the U.S. Army 3rd Infantry after their Chi**ok helicopter was crippled by enemy fire.