There is disclosed a deployable surveillance, security and/or enforcement unit, comprising: a container configured for deployment from a vehicle or by air at a surveillance, security and/or enforcement location; and two or more removable modules having equipment for performing surveillance, security and/or enforcement operations, wherein the container has a housing with at least one opening for receiving the two or more modules into the container. The unit may be comprised as part of a vehicle. The advantage of this arrangement is that it is flexible and can be deployed to meet temporary requirements, changing requirements, and can be easily equipped to meet differing roles. The deployable surveillance, security and/or enforcement unit may comprise removable modules including: a command module; a reconnaissance module; a sampling and diagnostic laboratory module; a decontamination module; and/or a utilities module.