SIEMENS GOVERNMENT TECHNOLOGIES INC - IGF::OT::IGF THE CONTRACTOR SHALL PROVIDE ALL LABOR, MATERIALS, EQUIPMENT, TOOLS, TRANSPORTATION, SUPERVISION, AND ANY OTHER ITEMS NECESSARY FOR THE PREVENTIVE AND CORRECTIVE MAINTENANCE OF THE UTILITY MONITORING AND CONTROL SYSTEMS (UMCS), DIRECT DIGITAL CONTROL (DDC) SYSTEMS, HEATING, VENTILATION AND AIR CONDITIONING (HVAC) SYSTEMS, SUPERVISORY CONTROL AND DATA ACQUISITION (SCADA) SYSTEMS, FIRE AND LIFE SAFETY SYSTEMS, MASS NOTIFICATION SYSTEMS (MNS), LIGHTING, ELECTRICAL DISTRIBUTION SYSTEMS, POWER GENERATION SYSTEMS, COMMUNICATION INFRASTRUCTURE, VERTICAL TRANSPORTATION SYSTEMS, ELECTRIC DOORS, FIRE DOORS, AUTOMATIC GATES, CLOSED CIRCUIT TELEVISION (CCTV), SECURITY LOCKS, AND OTHER ASSOCIATED SYSTEMS. SEE THE APPLICABLE ATTACHMENTS FOR A COMPREHENSIVE LISTING OF THE SPECIFIC MAINTENANCE REQUIREMENTS. THE CONTRACTOR SHALL HAVE THE APPROPRIATE LICENSES, CERTIFICATIONS, PROPRIETARY TOOLS, AND EXPERTISE TO PERFORM DUTIES AS REQUIRED. THE CONTRACTOR SHALL HAVE AN ACTIVE SECRET OR TS/SCI CLEARANCE AS APPLICABLE TO THE FACILITY BEING MAINTAINED. SECURITY REQUIREMENTS FOR EACH FACILITY ARE DESCRIBED IN THIS DOCUMENT.