US planes leave RAF base due to threat from Iran A number of US military aircraft have withdrawn from RAF base to other areas of the US European Command area. Among them are the KC-135R Stratotanker aircraft and the CV-22B Osprey aircraft. RAF Leikent and RAF Mildenhall have increased security measures. According to the Wall Street Journal, the redeployment is related to the threat from Iran. In addition, these facilities declared a state of "Charlie" combat readiness. This indicates the possible threat of acts of terrorism. @WarPeace And You.