Yes, the US Military issued steel cased .45 ACP ammo in WWII. I've got some WWII steel cased WWII 8mm Mauser and 9mm too (German). ALL US military .30 M1 Carbine ammo was/is NON-corrosive too, while the corrosive primed .30-06 ammo lasted until 1954, for target ammo, as the corrosive primer gave better accuracy. Yes, China made some "WWII style" steel cased M1 Carbine ammo, dated, I think, 1954 or 1955 that was corrosive. Some of it was sold as "US mil. steel cased .30 Carbine ammo", but it wasn't US made.
ALL steel cased cases (yes, including Berdan) CAN be reloaded (the factory loaded it didn't they?!). The trick is to use WAY, WAY "too much" lube when resizing, and wait for the "BANG!" when the boxer primer pops loose! First time I did it I thought it was a live primer going off!
Just for fun, you DO know that Col. Berdan, of Berdan primers was an American officer (later General) in the Civil War (aka war of Northern Aggression) and designed the Berdan primer don't you? Lt. Boxer (later Lt. Col.) of Boxer primer fame was an English officer who designed the Boxer primer. The hunters in the west NEEDED to be able to reload their own ammo, Europe (Royalty, corrupt politicos) were pretty much opposed to the slaves,,, er.... sheeple, ...ah... working classes having guns and being able to reload ammo, (a "right" reserved for the upper classes, don't you know) so adopted the Berdan primer. At one time the US ammo factories sold reloading kits for PRIMERS, but this was usually for shotgun primers, with primer pellets and anvils. You think 9mm loading is a pain? Try prying out the shotshell primer anvil, putting a primer pellet in the primer, and then seating a new anvil!
As to the Winchester steel-cased 9mm (or any other steel-cased "US" ammo), Winchester does not make the cases, they "import the cases and load them here to Winchester factory spec". At least that is what the Winchester factory lit. claims. I have not tried it, but have read reviews of it, which may or may not be totally accurate/true, as to accuracy, being dirty, etc. Some claim Win set up a seperate line for the steel cased stuff, with different (dirty) powders to force people to go buy their White Box ammo. I enjoy a good conspiracy story as much as the next person, but I have some trouble with the "two lines/dirty powder/load junk" story.