Set of military units under UNSAS, whose number exceeds the force requirement for the Brigade when it is deployed so that the deployment of the Brigade is not compromised if a State participating in the pool decides to abstain from providing troops for a specific mission; the requirement for individual Participating Nations to be able to decide on a case-by-case basis whether to participate in an actual peace-keeping mission makes it necessary to have access to a Brigade Pool containing duplicates of the various units which make up the Brigade, allowing for a certain degree of interchangeability between units of identical types assigned to the Brigade by different Participating Nations; besides, this makes it possible to tailor parts of the Brigade to the requirement of a specific mission, where an enhanced capacity is required in special functional areas.