Major systems and equipment includes facility HVAC, boilers, heat exchangers, refrigeration units, air valve units, variable air volume units (VAVs), fan coils, air handling units (AHUs), variable frequency drives, chiller controls, damper components, and controls, building automated systems (BAS) that are comprised of enterprise software architecture and networking of entire engineering systems, utility distribution systems, and ancillary equipment, fans, blowers, motors, direct digital controllers, and generators. The Department of Veterans Affairs performs pre-employment reference checks as an assessment method used in the hiring process to verify information provided by a candidate (e.g., on resume or during interview or hiring process); gain additional knowledge regarding a candidates abilities; and assist a hiring manager with making a final selection for a position.