A 'one size fits all' approach is destined to fail. There will be issues with people not reacting well to a keto diet.

If you want to have an elite dive group of specific operators that tolerate keto well, for a tactical advantage in extreme situations, that may work.

I also won't be surprised in the next year or two to hear about scientific studies that show keto diets are unhealthy. This always seems to follow the cycle of advocates promoting certain food choices that vary from the human norm of 'everything in moderation'.