Residential Security Team. These are the Officers that provide security at the Principals home, office and residences. Often these duties are performed by the PES when the Principal is not in transit. In larger teams however, the RST can be a separate team of people. This is often the first duty that entrants into the industry perform, as it is akin to a (non-uniformed) security officer, manning the gatehouse, securing the vehicles, patrolling the grounds and so forth.