Mattis: We won't disclose extent of MOAB damage

US Defense Secretary James Mattis said in a news briefing that the Pentagon would not disclose the extent of the damage from the MOAB (Massive Ordnance Air Blast) bomb dropped on an ISIS position in Afghanistan a week ago. Mattis said that the Americans had learnt from the Vietnam war not to estimate their success on the battlefield based on the number of people killed in attacks.