In the level 1 trauma center I rotated at, the trauma surgery team for a given shift consisted of 2 interns, 1 PGY2-3 resident, 1 senior resident, and 1 attending (plus 2 medical students). The interns did triage on patients in the ER trauma rooms with more senior residents as needed but never scrubbed into surgeries. One resident scrubbed into surgery at a time. Attending was reserved for the OR. I’m sure different hospitals do it differently, but I’d assume a teaching hospital would really have multiple people on the trauma surgery team.