While watching Midway and seeing the wounded, I remembered the practice of marking soldiers who weren’t able to be saved. Did this practice ever commonly occur, and if so, under what circumstances and events would this take place? Also, what films showed this practice, accurately or inaccurately?
/u/coinsinmyrocket has written about triage in WWII before, but focused on the ETO.
EDIT: Since this is one of those "throughout history..." questions, I have more for you:
/u/Celebreth has previously answered How likely was a Roman soldier to survive being wounded in battle?