I read once, I forget where, of a Japanese soldier’s observation that they had this in common with the Americans.
I think it is pretty much universal, and it isn't limited to a battlefield, either. Mommies are the naturally nurturing component of a couple, and kids instinctively turn to them for comfort and reassurance when they are hurt. We never outgrow that, and even after learning that Papa can fix boo-boos too, the hard-wiring exits.
It is only the Communists who think they can refute hundreds of generations of hard-wiring with an edict--and that is why they are doomed to failure. Nature prevails.