Firstly, OpenXcom is ace. Big thanks to the coders for letting me replay this awesome game.
I've been playing it this last week or so, and being bad at playing games, I cheated by amending my save game file to give a bunch of my characters better stats. The thing is, I'm lazy, so I only amended a few of them.
So, the hacked characters are tougher and faster than the rest of my troopers, and they tend to venture out further than the normal folk, and get shot.
And die.
Anyhow, one of my colonels, Simon Mathis, has started being... careful. Despite being able to run further than the other troopers, he lurks behind, hides behind walls, and basically lets the others get shot and die, before stepping out of cover and finishing the alien scum off!
https://thoggy.blogspot.co.uk/2013/11/simon-is-coward.html