Originally Posted by
Just L
I define the front line as "The place that marines and xenos are going to get within CQC range/one screen away from one another"
So crushers, ravagers, praetorians, warriors, defenders, etc. are all your front line, with the boiler right behind the front line. It is similar for marines, with the front line being where most of the marines are on offense, or the cade line they are behind on defense. Squad leaders, medics, specs, and sometimes engineers are usually inbetween the front and back lines.
In your example image above, the caves east of containers and north of sand temple is usually a front line. It is a terrible one for marines, but they go there anyway.
How often do you see xenos flank containers? LV usually has 3-5 main entrances as well as tunnels that the xenos can flank with. I have seen a number of marine pushes on the east caves crushed between boiler neuro spam and a handful of good xenos coming from the central, central-west, or far west t-fort and inflatable fort areas. Fire support is only good when xenos are either stationary at choke points or on the offensive, due to the vast majority of areas xenos will fight in being CAS-proof.
Yes, it is risky to do a flank, but it's also fun and engaging for both sides. It's an 'oh shit' moment until one side manages to overtake the other with it. Both sides have decent tools for flanking, but xenos are MUCH better at it due to the speed they can move from one area to another, and the few numbers needed to hold a chokepoint.