Where do I find the military uniform in CAS?

As far as I know you can't use a cheat to make them show up in cas. The easiest way to get them is adding a Sim from the gallery to your household who has already unlocked them. This will unlock the outfits for the entire household. Try searching the gallery for unlocked outfits or something similar. You can delete this Sim immediately afterwards and the outfits remain unlocked for this household.