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I would point out in addition the insurgency that we're facing in Iraq for all of its challenges is far less challenging that the Vietnamese insurgency . It takes a special person to choose to teach in a poor district that provides more challenges than incentives . NSF ’ s 2004 Sleep in America poll shows that we have more challenges before us . Marc mentioned that all of his treatment in the hospital became more challenging as his three weeks went on . This is typically no problem in a studio but might be more challenging in the field .