The Army is headed down this path. I'm involved in staffing some documents related to it.
Units will have a core METL, or CMETL, which is their default training tasks. When identified for potential deployment or given the international security situation, it will transition to a Deployment METL, or DMETL, which may or may not be similar to the CMETL.
So BDE X trains its CMETL in absence of guidance. The Army/Joint Staff identifieds a potential need for a X number of BCTs to deploy and conduct COIN within the next 12 months. Those units are issued a DMETL and given specific training resources to meet the DMETL standards. The DMETL may not be related at all to the CMETL.
So BDE X, a HBCT, trains its CMETL, comes on orders (actual or warning), gets a DMETL to train for. That could be COIN, FID, SSO, etc.
Or, the chief of staff orders x percent of the army to train a HIC DMETL, x percent a COIN DMETL, and x percent a stability DMETL, which shift based off of the likely operating environments. As units "lifecycle", the army maintains a balanced percentage of forces ready for anticipated commitments. A BCT could transition entirely to an advisory force for its lifecycle, for example.
It does presuppose a certian amount of knowledge of likely future commitments.
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