Final answer:
Brian Williams was removed from NBC's The Nightly News after admitting to exaggerating his experiences in Iraq, where he falsely claimed his helicopter was under fire.
Step-by-step explanation:
Brian Williams, formerly of NBC, altered details regarding his experiences during his time in Iraq. Williams initially claimed that he was aboard a helicopter that was hit by a rocket-propelled grenade. However, it later emerged that he was not on the helicopter that was attacked but arrived on the scene about an hour later.
This embellishment led to public doubt about his credibility, and following an internal investigation by NBC, Williams was suspended and then removed from The Nightly News.