I remember playing Duke Nukem quite a bit when I was a kid. I don't think I ever got very far as it got pretty tough for me, the whole mouse and keyboard controlling was really tough compared to using a SNES controller. I do know that I would always play until I could get to the strippers, what 14 year old boy didn't though.
The pig cops are one of the main baddies in the series, I hated the flying ones. You can't tell in this picture but I always thought it was funny that on the body armor it says L.A.R.D.