/ / Lock doors and gates of entrances and exits to secure buildings. Patrol industrial or commercial premises to prevent and detect signs of intrusion and ensure security of doors, windows, and gates. Respond to medical emergencies by administering basic first aid or by obtaining assistance from paramedics. Answer alarms and investigate disturbances. Circulate among visitors, patrons, or employees to preserve order and protect property. write tickets for improperly parked cars / /