In 2014, this figure was €1 million. Operatives from the Directorate of Military Intelligence can carry firearms on operations both at home and abroad, and those in the Directorate may not wear uniforms on operations. The Garda Special Detective Unit (SDU) works closely with the Intelligence Branch on domestic matters. Military Intelligence operates out of a number of locations in Dublin and County Kildare, and their headquarters are understood to be based at McKee Barracks, Dublin and the Department of Defence Headquarters in Newbridge, County Kildare. The latter is rumoured to house sophisticated modern technology for espionage, the building was completed in 2010 after a number of years of construction, at a cost of €30 million. Intelligence and language training takes place at the Military College, Defence Forces Training Centre (DFTC), Curragh Camp. In Ireland, national security is primarily the responsibility of the Garda Síochána (national police service), while the Defence Forces are responsible for intelligence. The Directorate of Military Intelligence Defence Intelligence (DI) Section is staffed by military commissioned and non-commissioned officers. It is tasked with providing intelligence support to the Defence Forces. Staff actively monitor relevant political, economic, social and military situations globally to produce intelligence reports and strategic studies to support operations. Personnel in this section can be found briefing all the way up to the Minister for Defence. The Directorate is responsible for conducting background checks of all Defence Forces personnel through close cooperation with the Garda National Vetting Bureau (GNVB). The Defence Intelligence Section is tasked with keeping members of the Defence Forces safe, be it in Ireland or abroad during active military engagements. The Army Ranger Wing Intelligence Section deploys in foreign countries alongside Military Intelligence soldiers during Irish military deployments, which are generally peacekeeping missions on behalf of the United Nations, European Union and NATO (Partnership for Peace), due to Ireland's policy of military neutrality. The Directorate of Military Intelligence National Security Intelligence Section (NSIS) deals with threats to the state and the Defence Forces. This includes identifying, monitoring and assessing possible threats to the state and Irish national interests at home and abroad, be it by hostile intelligence services, terrorist groups and/or criminal organisations. Counter-intelligence forms a large part of the section's remit, in addition to fulfilling counter-terrorist, counter-subversion, counter-insurgency, counter-sabotage roles, and physical security of critical infrastructure. The National Security Intelligence Section works very closely with the Garda SDU and Garda National Surveillance Unit (NSU) to spy on potential terrorism threats, particularly from Islamic terrorists and dissident republicans.