Can NATO task the COEs?

No, NATO cannot task the COEs, because they are not under command authority of SACT. However, in accordance with MC 0685, “COEs have a functional relationship with HQ SACT and are, consistent with their accreditation, expected to prioritize NATO requests, act as a primary advisor to the NCS in their area of expertise when applicable and have responsibility to support within their means and capabilities, subject to the approval and allocation of resources by their Steering Committee.