61.   But it should not set off a scramble to mount a new, nationwide missile defense system, as many Republicans now advocate.

62.   But Monday afternoon a senior administration official said Bush would not discuss the budget, schedule or the likely architecture of a new missile defense system.

63.   But said NATO did not believe it had destroyed the air defense system or removed its capability.

64.   But that support dips to below one third when respondents are told that many scientists say a missile defense system is unlikely to work.

65.   But Pentagon officials said later that the flights had not yet occurred because of concerns over weather and Serbian air defense systems.

66.   But the cost will soon outweigh the benefit, particularly because no missile defense system has yet been developed, he said.

67.   But the missile defense system must still pass one of two final tests to be held in September and next February before it can move to that phase.

68.   But the president got tremendous applause for his sensible promise not to embark on the expensive missile defense system advocated by Dole.

69.   But she remained firm on her goal to get Moscow to alter the anti-ballistic missile treaty to allow for a US missile defense system.

70.   But the research from that earlier effort could be incorporated in the missile defense system proposed in the new bill.