The Millie I have is an older PE 440V version.
Although I prefer lockbacks over linerlocks, I like the general shape and grind of the Military better for general cutting and slicing, though I like the appearance and solidity of the Police's blade more.
I find the Military in open position is more comfortable in hand, but I find the Police an easier carry overall. Honestly, I don't mind the slight extra weight of the SS Police. I own about 4 blade/steel version of the SS Police, and only the one Military. THough I like the grippiness of the G10 more than the SS handles, IMO the Police looks great in SS, and it clips quite hard to a pocket, yet causes minimum pocket wear due to the handles' slickness.
I've been concentrating on going back to carrying the Endura/Delica more recently, esp. my new Delica 4 CE. But one or other of my Police models have spent more time in my pocket than my Military; just turns out that way.
Jim