Here is solid, reliable content regarding the , including what it is, key features, and where to find a safe download. What is Emergency 4 La Mod 3.1.5? Emergency 4 (known in North America as 911: First Responders ) is a classic real-time strategy game where you control police, fire, and EMS units. La Mod (short for Los Angeles Mod ) is one of the most famous and comprehensive modifications for the game.