from 1 april 2014, the caa took over a number of aviation security functions from the department for transport. the new directorate of aviation security within the caa now manages rule-making and compliance to deliver proportionate and focussed regulation for uk aviation to ensure the highest standards of security across the civil aviation sector. air safety support international, a subsidiary of the caa, is responsible for air safety in the british overseas territories. the caa also manages all national security vetting for the aviation industry.