What other educational/historical firearms channels do you watch? (Patreon)

Edit - Thanks! I've got the info I needed. :)

Working on a multi-channel project, and I would like to get a better feel for what other channels people watch in the historical/educational firearms sphere. I've put in options for the active channels that came to mind for me, but please let me know if the comments if there are others you watch that I didn't include.

This is specifically about historic and educational focused material - so not the channels that are more entertainment based (Polenar, Garand Thumb, etc). Nothing against those channels; they just aren't the point of this particular project.