@Stukapilot123456 and @LoganTheBrawler have recently found and solved an Easter egg that lets you play as singing Neebs whenever you pick up the Infiltrator kit:
The only requirement you need is to equip the recently-unlocked War Tuba dog tag.
Once after, you’ll hear a special transmission that consists of two parts. The first one lasts indefinitely where Neebs can be heard singing Morse code. The second one can be heard only once and is a Battlefield Friends’ discussion.
What’s a weird choice? We’ve been discovering their Easter eggs through the life cycle of Battlefield Hardline and Battlefield 1 too, so this isn’t really the first one in the game.
I, for one, think Battlefield Friends are known in the community therefore the reference is also known amongst most players. I think it’s best if we don’t try to think whether most people get the reference.