At the end of this mod, you have to destroy an Osprey. Once you've destroyed the Osprey, immediately a helicopter shows up with almost comical timing. That's the perfect microcosm of this mod - it just NEVER gives you a break. There is just constant fighting. It's exhausting. I heard that this was one of the best Opposing Force mods but I didn't really like it that much. The environment design is pretty bland and poor, but I will give this mod points for its assassin encounters - whereas even the official Half-Life games tend to overwhelm you with a lot of assassins, this mod is comparatively much more reserved with its usage of them, with there typically being around 2-4 per encounter. I think this more reserved usage of them makes them much more manageable and enjoyable to fight. But overall, the mod is very tiring to play.