[John H K]

Typically a rule of thumb for the US (hard to tell recently because the number of casualties in combat has been so low you get statistical anomalies) is about one soldier killed for every 3 wounded. However, with the constant advances in combat medical care, even for a city fight I suspect the ratio may go down to 1 killed for every 5-6 wounded.

[Blood of Tyrants]

Speaking of advances in combat medicine, have you heard of the clotting foam that can be sprayed on a wound and seal it up? Supposedly, it can stop even arterial bleeding.