Ok, I've done a fairly extensive check with the search feature to see if this has been suggested before but can't find it so here goes. Essentially, I suggest the ability to tie coloured pieces of cloth to your player character (arm, head, chest, legs etc) as a makeshift group identifier. Your player could rip off a piece of cloth (possibly from a dead body, possibly from your own clothes) and colour it with blood, makeshift dye, grass/dirt or other colouring agent and tie it to your body so your friends can see more quickly at a glance whether you're part of their group or not. I've considered that this system would not be feasible on a large scale if there were only a few selections of colour or positioning, as there would essentially only be a very finite number of combinations, however if the game were to permit multiple cloths in multiple positions (within reason) it would be relatively simple to create a marker for your group which allows you to identify each other at a glance without worrying about using the same marker as someone else, and without ever fully removing the possibility of blue on blue, mistaken identity or false positives. It's also a logical behaviour for groups of survivors in such a situation to do, and can be pulled off with just tools immediately available. The group would still need to put effort into establishing a convention for their markings, and collecting enough materials so that their whole team could be marked accurately, and partially marked groups will still have the imperative of avoiding friendly fire on their as yet unmarked comrades. Some colours would logically be very easy to obtain, such as red, green, brown etc, others could be more difficult to obtain by mixing materials found in the field. Rarer colours would thus be more valuable as they would give less chance of another group having that colour, while more common colours are easier to obtain for everyone. I want everything to follow logically, and reflect how those colours could be generated with the basest resources available to a survivor. Further, groups would have to balance the identifiability of their marker with its impact on their camo. Obviously if you have arms and legs covered in red cloth you'll be really easy to identify but also really easy for others to spot. And yes other players would potentially be able to see your group's marker and match it in order to pass into your group that little bit more easily (I don't know about you but we'd always tend to notice if there was one more person than normal in the group), but fact is that'd be a genuine possibility and a genuine risk in the real world. I would prefer a simple aesthetic system such as this to a complex or imposed group system which cuts the immersion of dayz by overlaying an IFF filter or other system. I don't think it should degenerate into people covering themselves with different coloured cloths looking stupid and unrealistic, and I don't want this because I think avoiding friendly fire is "too hard", it's just a logical step which I personally would take if I were to find myself in such a circumstance. So yeah, that's my suggestion for a nonintrusive and thematic group support system. Please give any comments, suggestions, ideas and feedback.