WMATA Rail Operations Control Center (ROCC) Fire/Rescue Liaison. The schedule of the one (1) full-time officer assigned as the ROCC Fire/Rescue Liaison will consist of two (2) twelve (12) hour days, two (2) twelve (12) hour nights, and four (4) days off during each work cycle, for an average of forty-two hours per week. Leave taken by the one (1) full-time officer will not count towards the annual or casual leave slots.