Sources for factual combat statistics, was Re: Modern Close Assault

In message <ab.336a64f.274b2021@aol.com>, Fabet@aol.com writes:
> 
> Most firefights in Nam took place at under 50 meters.

I occasionally run across stats like this, and others such as numbers
of wounds vs. kills, types of wounds taken, etc...  Factual, supported
stats like this would make a great measuring stick against any rules
set.  Does anybody know of a good source for this sort of thing?  I
would guess that most would have been collected in "modern" conflicts,
but older would be welcome as well, especially to compare to modern
stats.