More detailed credits can be found inside the PK3 archive.

Code: Inkoalawetrust, Lewisk3 (Base code for making turrets usable by players), Boondorl (Swimmable 3D floor detection)
GLDEFS: Inkoalawetrust
Sounds: Valve, freesound.org, GDC Audio Library, Call of Duty 2, edited by Inkoalawetrust
Sprites: Sergeant_Mark_IV, Ghastly_Dragon, Das M., Superdave938, Mryayayify, Tabijaky, Gorman Freebmane, Inkoalawetrust, TG5, Vader
Sprite Edit: TG5, Tabijaky, Inkoalawetrust
Idea Base: Having NPCs in Doom with a higher IQ than a wet towel. Half-Life 1 HECU (Partially)