Not going to pay. Is there any justification for the number, or just a “this is how many we need” statement?
Again, 10:1 is just absurd on the face of it.
I believe it has to do with cubic capacity. A single C-5 can transport 2 Abrams tanks plus a bunch of other stuff, a C-17 can only carry one and not so much extra. Remember, the C-17 is between the C-130 and the C-5 in size.