Wrong
Yes, opinions do vary with this. I suppose part of my opinion comes from my core belief that our body is just a thing we occupy in this life, and when it dies we are no longer in it. It is just a thing to be discarded.
And if a guy is in a kill zone and bleeding out, and sending someone else out to retrieve him is basically just guaranteeing a higher body count, then it is simply throwing that second life away. Not a good look, to say the least.
But I guess the Japanese did that quite a bit towards the end of the Pacific war in 1945.