Im not Herc expert, in fact my experience of them is quite a few trips in the back (Germany, Kenya, States via Goose Bay, Afghanistan) but whilst i was in Kabul (2004) there was a J model down by the CIA lot (sshhh!) and we use to provide fuel for it. I got a chance to go to Uzbekhistan, to the US base there, to collect some fuel samples of that dodgy Russian fuel. I was invited to sit in the middle seat coming into land at Maz Ar Sharif (forgive spelling) and it was unbelievable the G's that were pulled coming into land. We started very fecking high and going in, what seemed like a spiral, all the way to the ground. I had a camera in my hand but due to the G, couldnt lift it to take a pic. Apparently the pilots were SF ones, well the Hereford lot used to go out with them, and i was amazed at what the plane and the pilots could do! So as to the original thread title, i myself saw nothing wrong with what a J could do! But then im a Squaddie so what do i know!!