MOS? How about:
A United States military occupation code, or a military occupational specialty code (MOS code), is a nine-character code used in the United States Army and United States Marines to identify a specific job. In the United States Air Force, a system of Air Force Specialty Codes (AFSC) is used. In the United States Navy, a system of naval ratings and designators are used along with the Navy Enlisted Classification (NEC) system.
I saw that, too, when I looked at list of possible acronyms.
But the others were right, IMO, in that context "C_A/MOS" - I think it has to be 'company' / MOSsad
ALL - in the pic at Avenatti's office, there is also a car approaching in the distance that might be of interest here; I blew it up but can't make out anything worthwhile. Some are speculating it's the head of Democrat Party in CA, Eric Bauman but I don't think so