The current organisation of the Swedish defence has highly specialised units which requires time to assemble. During this period, there would be no opposition for a forward operating resource such as an aerial troop landing. However the National Defensive Forces are stationed in the area where they live. In case of a surprise attack, the National Security Forces Handbook states that the National Defensive Forces are to become an integrated part of the dynamic response of the Swedish defence. Since each operator is stationed in the area they live in, they know the terrain, they notice when something is out of place and thus will likely be the first to detect and respond to an incursion. By using knowledge of terrain they are to deny, delay or harass the opposing force until friendly specialised units have been mobilised to the given theatre. They can also aid with this knowledge to achieve synergy in the counteroperation.