As promised I added the GOG.com source for the Delta Force series in Porting Kit! This means for the following games Porting Kit have the GOG.com source: Delta Force including multi-player possibility, Dellta Force 2 also includes multi-player. Delta Force Land Warrior (multi-player), Delta Force Extreme (Single player only) and Delta Force Taskforce Dagger (Including Multi-player). All those games also have a cross-tie using Crossover (also for Linux!).
If you don’t own the Delta Force games yet, get them quickly on GOG.com! Have fun with those classics!