Adds flies to dead bodies. After between 2-5 minutes, flies will begin to gather around a body, increasing in density each 15 minutes or so, up to a maximum fly density. You can tell *very roughly* how long a body has been dead, and coupled with a suitable blood addon that simulates blood splatter (there are a few, ACE2 and SLX for example), you can perhaps work out what, where and even when something happened, in a very general and rough way 
Also, it might allow you to find a body among severe clutter when you’re looking for one, for example when you’re out of ammo or something
*edit*
Forgot to mention -- there will be no flies if it rains OR if fog value exceeds 0.75.
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Tags: ArmA2, Armed Assault, visual effects