I would suggest they are just stories. The vehicle's longevity (Jeeps and CMPs, along with just about every other military vehicle made) indicate that they were not made for 6 months use. Why would you waste putting grease nipples onto U joints if they were not expected to be around more than a year?
As to combat life expectancy, I would suggest that there are so many variables to combat conditions, that there would be no hard and fast numbers.
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