It has to be said - the record of US Forces in blue-on-blue incidents in action is appalling. It also appears that few lessons are learned. It also appears that there is a cult of needless secrecy in covering up errors. It further appears that the MoD are prepared to bend over and say "Yes Sir" when so instructed by the Pentagon.
None of this will assist in preventing more tragic incidents like the death of Matty Hull.