First, although the initials WCC do stand for Western Cartridge Company in the commercial world, it was the government designator assigned to ammunition produced at the East Alton, Illinois plant. Initially this was the site of Western Cartridge Company but the Winchester ammunition production moved from New Haven, Connecticut to East Alton around 1958. Winchester had gone bankrupt in 1931 and was bought by the Olin who also owned Western Cartridge Company. Under Olin, initially Winchester was a subsidiary of Western. So Winchester and Western merged their production lines at East Alton about 1989 and everything was Winchester thereafter. Winchester is now moving their plant to Oxford, Mississippi, and it appears that the government assigned WMA to its ammunition produced at the Oxford plant. Production of 9mm ammo with the WMA non-NATO headstamp began in 2012 and both WCC and WMA NATO headstamps were produced in 2013. I've also read on other forums that there is a WMA 13 headstamped 40 S&W, but I haven't seen it.
Anyway, to muddy the identification even more, Winchester produced the Q-line of ammunition starting in 1983. This ammo apparently was produced for the survivalist crowd and was headstamped WCC over the years 1983 through 1989 (note the 19). This production was commercial and not for the government. It was produced in 9mm Luger, 38 Special, and 45 Auto at least; and I've heard 30 Carbine and 223 also, but I haven't seen the later.
AND to mess things up even more, variations of the WCC headstamp were produced for Winchester by Israel's IMI (W (dot) C (dot) C) over 01, 02, and 03 at least; and South Korea's PMC ((dot) W C C (dot)) over 0 (dot) 8 and 0 (dot) 9, at least.
So, if you have the WCC 1987-headstamped 9mm Luger, it was Winchester commercial production with no crimp. If you have (+) WCC 12 9mm Luger cases, it was produced for the government with the crimp, however reject and overrun cases show up in Winchester White boxes both crimped and uncrimped.
By the way, I'm an ammunition collector and this is pretty well known among us, except for the WMA designator, which is the subject of some differences of opinion.