Originally posted by Maur0:

For this mod if you are using it:
https://steamcommunity.com/sharedfiles/filedetails/?id=2291140471

These would be the original commands to add to each infected common models.

//L4D2 Common Infected "common_female_tankTop_jeans" "female" "common_female_tankTop_jeans_rain" "female" "common_female_tshirt_skirt" "female" "common_female_tshirt_skirt_swamp" "female" "common_female_formal" "female" "common_male_dressShirt_jeans" "male" "common_male_polo_jeans" "male" "common_male_tankTop_jeans" "male" "common_male_tankTop_jeans_rain" "male" "common_male_tankTop_jeans_swamp" "male" "common_male_tankTop_overalls" "male" "common_male_tankTop_overalls_rain" "male" "common_male_tankTop_overalls_swamp" "male" "common_male_tshirt_cargos" "male" "common_male_tshirt_cargos_rain" "male" "common_male_tshirt_cargos_swamp" "male" "common_male_formal" "male" "common_male_biker" "male" "common_male_ceda" "ceda" "common_male_mud" "crawler" "common_male_roadcrew" "undistractable" "common_male_roadcrew_rain" "undistractable" "common_male_fallen_survivor" "fallen" "common_male_riot" "riot_control" "common_male_clown" "clown" "common_male_jimmy" "jimmy" "common_female_tankTop_jeans_swamp" "female" "common_police_male_l4d2" "police" "common_male_inmate" "male" "common_male_sanitation" "male" "common_male_roadcrew02" "male" "common_male_roadcrew_rain02" "male" "common_male_hoodie" "male" "common_male_tshirt_jeans" "male" "common_military_male_l4d2" "male" "common_male_trackjacket" "male" "common_male_polo_generic" "male" "common_male_fireman" "male" "common_female_biker" "female" "common_female_polo" "female" "common_female_polo_generic" "female" //L4D1 Common Infected //"common_patient_male01_l4d2" "hospital_patient" //Removed; redundant asset to add to the precache. The model is still in the game files for any maps that may still use it as a prop. "common_female_nurse01" "female_l4d1" "common_female_rural01" "female_l4d1" "common_female01" "female_l4d1" "common_male_baggagehandler_01" "male_l4d1" "common_male_pilot" "male_l4d1" "common_male_rural01" "male_l4d1" "common_male_suit" "male_l4d1" "common_male01" "male_l4d1" "common_military_male01" "male_l4d1" "common_patient_male01" "male_l4d1" "common_police_male01" "police" "common_surgeon_male01" "male_l4d1" "common_tsaagent_male01" "male_l4d1" "common_worker_male01" "male_l4d1" //L4D2 Anniversary Update Common Infected "common_male_parachutist" "fallen" //L4D1 Anniversary Update Common Infected "common_male02" "male_l4d1" "common_female01_suit" "female_l4d1" "common_female_baggagehandler_01" "female_l4d1" "common_male_baggagehandler_02" "undistractable" "common_male_mud_L4D1" "crawler" "common_male_ceda_l4d1" "ceda" "common_male_roadcrew_l4d1" "undistractable" "common_male_fallen_survivor_l4d1" "fallen" "common_male_riot_l4d1" "riot_control" //L4D1 Common Infected before Anniversary Update. Changed to different 'genders' for gore system //"common_patient_male01_l4d2" "hospital_patient" //"common_female_nurse01" "hospital_patient" //"common_female_rural01" "hospital_patient" //"common_female01" "hospital_patient" //"common_male_baggagehandler_01" "hospital_patient" //"common_male_pilot" "hospital_patient" //"common_male_rural01" "hospital_patient" //"common_male_suit" "hospital_patient" //"common_male01" "hospital_patient" //"common_military_male01" "hospital_patient" //"common_patient_male01" "hospital_patient" //"common_police_male01" "hospital_patient" //"common_surgeon_male01" "hospital_patient" //"common_tsaagent_male01" "hospital_patient" //"common_worker_male01" "hospital_patient"

The police, military and worker, just remove the "_l4d1" and it will work.