This is a server-side mod that was running on Frosty's Playhouse SWAT 4 Hell servers, for the COOP games. The mod was under development, and I didn't finish it. So, some of the features this mod provides are left being in the alpha/beta phase. However, for the release, I've modified them a little so that you can enjoy those unfinished features somehow.
{FP}TurtleKing video Youtube.com