Indeed, this story came up on the Today programme in the past hour. If the present MOD view is that personnel 'embedded' operate as foreign troops, that is a considerable shift from, for example, the early 1970s view when those of us on Exchange with the USAF were not permitted to take any active part in operations in Vietnam. (And, for what it's worth, I later found that USAF personnel with the RAF were not supposed to go to Northern Ireland or Belize.)