I recommend getting GCFScape for this. First, go into singleplayer sandbox and toggle between all of the normal rebel models (Group3 is rebel) as your player model. Check the console for which ones are missing via the spam message. Keep note of which ones were missing, and then go into the...
Hell, i'm getting this every time I join TRP now, even after doing all the fix methods; it was working fine for me a couple of days ago. Oddly the same thing occurred with a Radiation Sandbox server once, but hasn't happened again since then.
Edit: A join attempt just now gave me this little gem:
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