MS I and MS II cadets, who are in their first and second years in the Corps and do not have prior military service, wear an ROTC patch on their left shoulder and the A&M patch on their right shoulder. Any cadet who does not sign a contract to commission as a military officer upon graduation then wears the A&M patch on both shoulders during their third and fourth years in the Corps, plus they do not take MS III and MS IV classes.
The only reason a fish would be wearing two A&M patches is if they are a military veteran who is a drill and ceremony cadet with no intent to be commissioned a military officer upon graduation from Texas A&M. The veterans have already completed the equivalent of MS I and MS II classes in boot camp so do not wear the ROTC patch and do not have to take MS I and MS II course work.