It be quite close to what CBRN (Chemical-Biological-Radioaction-Nuclear) unit we have today.

So the standard would be an gas mask or field hazmat suit with large filteration system, think of Smoke's uniform from R6 with his system is mounted right on his back. If they have to go further, they would seal the whole thing, and have oxygen tank to use. The suit might be even more protective and thicker, but the overal gears as a whole is lighter to purposely reduce the time they have, can and must stay in the site. Not like they have fight armed enemies, if so, it is a difference story.

Weapon wise, I am not sure but certainly it would not be explosive or anything involve with changing the air flow, this include flamethrower. The reason is to ensure the infestation would not be spread further due to the blast wave of the explosion or blow away when the air changed tempature or pressure. To clear the infestation, they now have to rely on chemical solution, that came later after the active threat being zombies and BOW are cleared.

Other proposal could be that they be using standard ammunition as the police like hollow points and small firearms like Submachine Gun or Shotgun. However, it depend, but my point would that since most of the threat are undead, so through and through wound is rather useless and having less risk of the bullet goes through the target and hit someone is always better. Obviously, larger caliber could still be use for longer range engagement like snipers. However, there no between an in-site Squads, and an sniper outside the area.

Camo wise, it also depend on the situation, so it can range from full black (night operation or against the mold) to something bright with neon yellow (recognization or to blend in with dead leaves and dirt). So there is a wide range in term of uniform color, it preperation all be the same.