Adding playermodels

Hi I am trying to add playermodels to f2s stronghold and I am a bit stuck, here is a small amount of code to add playermodels:

["BF4 US 1"] = "models/player/us_01.mdl",

["alyx"] = "models/player/alyx.mdl",

the alyx model has a model, but the bf4 one is an error, so I went into models/player and the alyx mdl file was not there, so what am I doing wrong. The models download to the client from the workshop.