Reason: so instead having a plain sky box why not make it halo theme for a limited time.
Evidence: https://steamuserimages-a.akamaihd.net/ugc/2010327338014248662/75F8CC91DEF9839F699C70C53918EC2BFB51BD1E/
extra info: I do not know how to change the skybox or replace the skybox and there is a way to get like closed thing that gmod has to halo sky boxes are these maps I’ve checked steam workshop but they don’t have a halo skybox
Halo ODST
halo ce
Halo 2