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One of the original NATO standards for diesel fuel was "F54" which was fine for most equipment but anything with a gas turbine (such as the M1 Abrams) had problems with the diesel, especially in very cold weather. In the late 80s (I believe '88, DOD tried to standardize on a single fuel concept to reduce logistics costs. JP8 was the selected fuel as previous blended fuels (50% diesel & 50% JP5 or JP8 ) caused problems in storage & handling of multiple fuels. I suspect that since our MEPs were in service at the outset of this single fuel directive, orders came down the chain to modify the stenciling to reflect the one-fuel directive of JP8. Why it happened on some units and not others, who knows??
You're correct--I forgot the new rules went into effect in 2010...times flies when you're having fun. I had access to marine diesel which was exempt from the ULS requirement. I think the ULS requirement will phase in by 2014 for the smaller refineries and this year for the larger refineries.
