I think it is a pretty excessive leap of faith that some guy was wearing ICRC markings during the rescue attempt from the minimal evidence I saw displayed at the link. (F6 source and content eval from where I sit.) BTW, I thought the rescue operation was based on a deception--the rescuers were passing themselves off as FARC insurgents, come to move the captives to another location. So, if an ICRC marking was worn, perhaps that is a tactic used by FARC and was used by the rescuers to improve their credability as bad guys rather than to pass themselves off as ICRC personnel.