I've just watched episode 1-2 of Terranova, and there is a scene in which a military squad goes to the rescue of some teenagers who are surrounded by dinosaurs in a jungle. When the squad arrives, their leader orders, "Establish a perimeter!", and some soldiers form a "circle", protecting the area where the teenagers were trapped. That way, they could operate in relative safety while in the area.
This whole manoeuver thing got me thinking about tactical-level formations for operations (and not for marching!). This kind of strategy could be used by the players or against them, giving more flavour to combate. I went to Google to find out more on this, but just got marching formations, which isn't what I'm looking for.
Does anyone know about some other formations, or can tell me more about orders like these? I'm not asking for rules, but for info on how the real-world tactics work, so anyone could adapt them to their favourite system.