1st Membranes
The regiment is the 1st Emperor's Membranes, colloquially known as the Exploding Brains. An Inquisitorial Black Ship crashed on a small forge world, where the remaining figures of authority were almost entirely dead save for the IG regiment command already on the planet. The psykers freed from the ship were absorbed into the regiment, with many of the former soldiers being moved into command positions, including the commissariat, to better watch over their psychic charges. This huge upsurge in the psychic gene has bred true for the citizens of the forge cities ever since, resulting in an unprecedented 97% psyker population within the regiment - a smaller percentage exists within the population at large.
The uniform consists of a tinfoil-lined helmet, white and grey lab coats, a respirator, and a suit of flak armor. The regiment is also known to have four imperator titans.
http://suptg.thisisnotatrueending.com/archive/19639982/
"Is this vox-caster on? Uh, right. Today was my first day in the Membranes. One of the older guys said we were called the "Emperor's Powder-Kegs" but I think he was just trying to frighten me. I mean, we're well trained, no-one's going to actually explode, right? The camp's actually pretty nice, we've got plenty of rations, and not the usual corpse-starch stuff either, I mean actual food. I haven't had proper meat since throne knows how long. I took a stroll around the camp today. It was pretty peaceful, apart from the occasional screaming, and the odd mad gibbering, but I mean, that's the danger of being a psyker, right? The Commissar I mentioned it to said they'd be taken care of as quickly as possible. That made me feel much better. I talked with some of the guys, they're a good lot, far as I can tell. Not what the propaganda says psykers are like at all. I played some cards with some of the other troops and then the call came for lights-out. I'm looking forward to my first combat operation.
Now, if only I could get the voices to SHUT UP!"
"Deliperonacus and Carofelaferrocus said I was a very bad person today. I told the Medicae about them, he said to wear this special helmet he gave me, it's all shiny on the inside. Deli and Caro are both gone now. I got a really good nap around midday, without them both telling me to do things. I met another trooper earlier, Hera. She's really nice. I spent the afternoon chatting with her, but when I told my new friends about her during poker, they all went really quiet. Said she's an 'odd one'. I don't know what they mean by that, they wouldn't tell me anything else. Anyway, the order's come through that we're on the way to the frontline! Apparently foul xenos are attacking a holy Imperial forge world nearby, and we're the closest regiment. I haven't seen proper combat since I was bumped through Mental Conditioning when I mentioned my voices to the Medicae in Basic Training, but I've been told it's really exhilarating."
"Thing's have been getting WEIRD, servo-skull. The voices have stopped, thanks to the Medicae's shiny hat, but I'm noticing all kinds of weird things happening. The worst was today on the ship to Phobius IV, that's the forge-world we have to defend, and me and Hera were chatting over dinner rations. She asks me "so what did you have for breakfast, Derik?" And I says, "Slaughterbeast and pickled eggs", and she starts shaking all over, and then picks up her fork and starts stabbing her hand with it saying it was "full of spiders!" Well I made myself scarce quick-as. She's pretty, but I don't do crazy girls. Well, maybe that one time, but not as a matter of course. We'll be at Phobius four soon, I'm really excited!"