Based on the following selection, which of the following will likely be contacted for assistance in a large-scale emergency? Per-diem firefighters and EMTs are part-time employees who may work scheduled hours and are specifically assigned to a district station. On-call team members are available for work, and will come in for extreme circumstances when more personnel or their specific expertise is required. per-diem EMTs per-diem EMTs on-call firefighters on-call firefighters volunteer EMTs volunteer EMTs per-diem firefighters