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(Reuters) - U.S. weapons maker Northrop Grumman Corp NOC.N said it along with its principal teammate British defense company BAE Systems BAES.L have decided not to submit a proposal for the U.S. Air Force's $16 billion T-X Trainer program.

The companies had examined the requirements and acquisition strategy for the pilot training program and decided that it was not in the best interests of their shareholders, Northrop said.