Spoiler for full sprite sheet:
Spoiler:Credit to Solmyr and Metal_Spaghetti for the melee marines. Probably OSJCLatford as well? I don't remember for sure, but I've been tinkering with his possessed sprites a lot, as you can see, so there's probably some of them in there too.
Spoiler:CREDITS: Amuscaria, NMN, Craneo
Spoiler:Credits - Rogue Entertainment and Craneo
Spoiler:Credits - id Software
Spoiler:Credits - id Software, Raven Software, Wolfendoom, Amuscaria