GENERAL Based on SMERWG Terms of Reference (see also SMERWG yearly RAL) Nations are requested to provide the Custodian with updates to their data on a regular basis@ keeping NSA informed. Nil responses are required. Data not provided@ because of their classification or because of national policy@ will be made available to the appropriate Rescue Elements by the DISSUB National Authority on a case by case basis@ through the DISSUB Liaison Team. National data are also available on the ISMERLO WEB-site (password protected area) to accredited SMER Nations. Columns ows with data may be added should a Country have more than one of a kind asset.