What is kamerad?

a historian that likes German empire so much and often upload military marchs in his YouTube channel.

Shin : Yo do you know that cool guy? Who's his name?
Ternat : It's DerMarschlied Kamerad,i think.

kamerad - meme gif

ComradeKamerad in German also nickname of a wise historian in discord

Shinchan: Hey I wanna know more about WWII
Rokkett: call kamerad,he knows a lot