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Still a lot of hearsay. I resepctively disagree with a number of the points outlined.

A reasonable argument can be made that if the military thought that drain back was a great feature, they'd have specified it on other vehicles/ equipment. Is there anything else which has this "feature"? The early gasoline trucks did not nor did their civilian counterpart. Does the Cat in the...

There are bypass valves for both the filters and the cooler. Heated oil from the pan can circulate right around cold oil in the filter OR cooler. Practically speaking, the drain back PROLONGS the time for oil to reach critical areas and is a prime reason cited for adding the spin on adapters...

If I recall correctly, he indicated that it was speculation. It would be interesting to see if any of the SAE papers address this.

Are there any references or justification for the idea that the military WANTED the oil to drain back? In normal designs (this one too) the oil can simply bypass the oil filters. Design flaws do happen.......