ECM is presumably <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Electronic_countermeasure" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Electronic_countermeasure</a> ...<p>(if dear reader, like me, had no idea what ECM meant in this context).