The US public is not nearly as adverse to casualties as many think. The public will accept casualties without a qualm (except for the chattering classes, who have qualms about everything...) provided results are being obtained -- fail to get results in your war, the public will eventually get angry at non-performance, not at casualties. The US Congress, OTOH, is a different thing. Congress always wants to appear as doing something about any problem, no matter minor or major, their reaction is the same -- panic! then pass another law, quickly! Idiots.
The larger issue is not US aversion to casualties, it is NATO aversion to them and therefor the potential for early departure from the theater and fragmentation of the coalition. That will create an added burden on the US to compensate as a result. Congress (not so much the public) will not be pleased.
The various fighting factions in Afghansitan, including but not limited to the Taliban are well aware of all that and while they will inflict a number of casualties on the US due to the sheer size of the troop commitments, they will concentrate on inflicting casualties on all the other Nation's forces in country. They are in particular targeting Canada and have said so, I suspect that their next in line targets are the UK and Germany as they are the two largest force elements aside from the US. They'll keep tweaking Canada just to insure the Canadians adhere to their stated 2011 withdrawal plan. I anticipate increased attacks on the Italians and Spanish as well.
All that said, Haddick is correct in that they are aiming for casualties versus western impatience as as a strategy. That should not be a surprise to anyone. It could easily have been predicted in 2001 -- or 1966 or 1952...
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