relation to an alleged assault). From 1 October 2012 to 31 March 2019, the chief constable of the CNC was retired Brigadier Michael Griffiths. The Deputy Chief Constable Simon Chesterman formerly of Thames Valley Police who is also the National Police Chiefs Council lead for firearms policing took over as chief constable. The new temporary deputy chief constable is Chris Armitt formerly of Merseyside Police since 1989 who served eight years in the Royal Engineers. The new temporary assistant chief constable is Duncan Worsell who has served with the force throughout his career. Previously he was North and Scotland divisional commander, operational unit commander at Sellafield and chief firearms instructor. Unlike the majority of the British police territorial forces, all frontline CNC officers are routinely armed while carrying out duties. CNC officers also operate the armament on board the ships of the Pacific Nuclear Transport Limited, a subsidiary of International Nuclear Services, which specialise in transporting spent nuclear fuel and reprocessed uranium on behalf of its ultimate parent, the Nuclear Decommissioning Authority. Such ships have an onboard escort of armed police. The CNC is authorised to carry out covert intelligence operations against anti-nuclear protesters. In July 2009, Judge Christopher Rose said the CNC's "approach to covert activity is conspicuously professional". He found that the system for storing the intelligence gained from informers was "working well" and that "senior officers regard covert surveillance as a long-term requirement". Legal jurisdiction Any place when escorting nuclear materials in transit Any place when pursuing or detaining subjects who have unlawfully removed or interfered with materials guarded by the CNC, or have been reasonably suspected of being guilty of doing so Civil nuclear sites Land around such sites up to 5 km from the boundary. Shipyards when safeguarding such nuclear materials See below section 'Mutual aid' when this jurisdiction can be extended in support of other forces. Locations The CNC operates at a total of ten sites in England, Scotland and Wales (there are no "relevant nuclear sites" in Northern Ireland). Of these, three are classed as Operational Units, where an ordinary police presence is maintained, while eight are Support Units, which have an overt armed police presence. CNC Headquarters Culham Operational Units Support Units In 2007, the CNC adopted a structure similar to other police forces when it introduced three Basic Command Units, each headed by a superintendent, based around the geographical locations it