Moody's cuts outlook on U.S. banking system to negative, citing 'rapidly deteriorating operating environment'
The firm, part of the big three rating services, said it was making the move in light of key bank failures.
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### Instruction: Moody's cuts outlook on U.S. banking system to negative, citing 'rapidly deteriorating operating environment'

### Response: The firm, part of the big three rating services, said it was making the move in light of key bank failures.