Good catch, JB! Yes, I do put a wax paper disc on top of the powder before the grease cookie. I have never kept these for very long to see if the lube would migrate onto the powder.
In fact, I'm still experimenting and have tried both putting the cookie in first (on top of the waxed paper), vs. putting the plastic wad in first, with the grease cookie next and then the bullet. But to prevent the cookie from sticking to the base of the bullet, I put a waxed paper disc on top of the grease cookie.
And I don't know which way is better. Sometimes it seems like one way shoots better, but then at the next range session, it seems like the other way shoots better. Maybe there really is no accuracy difference between the two methods.
Re: the military? I don't know how they did it. I'd be interested in finding out.