Certainly in the infantry everyone used to carry a rifle. SMG for BG HQ types. But even in Air Portable ops the Coy HQ is vehicle mounted. Not much *lugging* of anything going on there. Quite right too.
Swords...?! What happened to them ... always enjoyed a bit of pig-sticking!!
But seriously a nice big gat is always good, can be used as butstroke people also means you can shoot peole further away - stops getting blood on your combat - real pain to get out of combats. Just remember to keep it within an arms length at all times or in the shoulder and you can't go wrong