Operation Vigilant Guardian
Operation Vigilant Guardian was a Belgian army operation following the January 2015 Île-de-France attacks and the dismantling of a terrorist cell in Verviers having foiled attacks imminent, to deal with the terrorist threat and protect the "points" sensitive territory. The operation was put in place 16 January 2015 and ended on 1 April 2021.
Source: Wikipedia — Operation Vigilant Guardian (CC BY-SA 4.0)