Read in a US broadsheet a few days ago (before this latest tragedy), that there was rising concern about the 3 most recent downings of US helos. There was speculation that the Iranians might be supplying different kit in theatre. As the ante is upped between US and Iran I guess this is to be expected.
We certainly need the very best self defence systems in our own aircraft.
Sincere condolences to the families of those killed in this latest incident.