In terms of optimum 'military' fitness, what is a sensible body fat percentage to aim for? I currently weigh 13st5lbs or thereabouts, with 15% fat. I feel this is a bit high, if I dropped to 10% fat or thereabouts, then I would loose about 9.35lbs of effectively 'dead weight' which is presumably, only going to be a good thing in terms of my speed etc. However, I'm not sure that 'cover model' levels of fat, like 4% or 5% are really a good idea, as I expect it will reduce my long term '3 weeks in the field' endurance. What's the received wisdom on this?