[They can be used to react quickly to reports about Taliban and al Qaeda forces in the area, said J. Kelly McCann, a former Marine involved in special operations.] Intelligence is so fluid right now, ... To fit somebody in place in order to go kill them, you've got to be able to respond quickly for that information to be useful. So now with the Marines on the ground you're talking about a reaction time that's under an hour in some cases, maybe minutes. Kelly McCann