I hereby declare November to be Delta Force Month!
(I know, not as catchy or expensive as D&D month.)

Commemorating the time when we thought this old series of shooters was simple dumb game design for simple dumb fun. Then came Call of Duty and its ilk to show us that nope, we haven't seen dumbed-down even remotely.
Therefore, if your experience with shooters is to follow the narrow corridor pointing at the next objective indicator, turn around now, you would never find the exit of the first level.
If you remember shooters that involved actual gameplay, well, then I hope like fiddling around your PC to make an ancient voxel-based graphical engine work.