OK, slitting throats killed the enemy. Fine.
Why cut off dicks after this? Strange paraphilia? Taking dicks as trophies? Dehumanise the enemy? Imagine going to the effort on an exposed battlefield to get a corpse in position to be able to cut off the trousers and find the dick under the clothes to cut it off in a bloody mess (chopping off a dick from a fresh corpse will bleed like crazy). WTF