ECM is presumably https://en.wikipedia.org/wiki/Electronic_countermeasure https://en.wikipedia.org/wiki/Electronic_countermeasure ... (if dear reader, like me,

ECM is presumably https://en.wikipedia.org/wiki/Electronic_countermeasure https://en.wikipedia.org/wiki/Electronic_countermeasure ... (if dear reader, like me, had no idea what ECM meant in this context).