US Secretary of State John Kerry has for the first time expressed the need for a ground operation against the Islamic State, saying "there will need to be people on the ground," and that he was "convinced there will be at the appropriate moment."The ultra-violent Islamist organization "has made that more clear putting its exclamation point on that reality," Kerry told CNN's Christian Amanpour on Wednesday. Washington's top diplomat did assert, however, that the White House has ruled out the chance of US forces being deployed for such an endeavor."For the time being the president has made it clear that American troops are not part of that equation, and I don't think that he has any plans to change that," Kerry said. Kerry referred to "very specific ways" of defeating the self-styled Caliphate, methods that, he said, include "other countries in the region.""There are others who are talking about it, there are people in the region who are capable of that," Kerry went on, without naming which specific countries would potentially contribute ground forces to a theoretical intervention in Syria's bloody four year civil conflict.