The Hostile Intent Website has the debut release of this Half-Life modification. Here's their description of the mod's focus on realism to give a sense of what this is all about: "Hostile Intent is all about realism, covering realistic weapon damage, realistic missions and mission stories. Hostile Intent gives the player the feeling he's actually there. Be it a nuclear submarine, an embassy raid or a military base in the middle east, each and every one of them is modeled with a level of detail that a lot of other games/mods/tc's don't have."