NATO allies have serious reservations about the United States' pursuit of a National Missile Defense system, Gen. Wesley Clark, commander-in-chief of U.S. European Command, told a House committee yesterday. They fear it may throw out of balance the strategic policy Europe has lived under for the past 50 years. "I think that concern is driven by several factors," Clark told the House Armed Services Committee. "First, they don't see the same threat that we see so they don't see the...