When playing in Spartan Ops, the Energy Sword makes no sound when picked up. It also make no sound when swapped.
Ah dang! This sounds like this is a ticket-worthy problem. Head on over to the Support Tab at the top of the website and type in the specifics if it’s not already acknowledged.
I’m sure this will get fixed soon enough.
As a matter of fact, its already been fixed. I play Spartan Ops earlier today, and the Energy Sword was making noise like normal!