I work at the same unit and the op order paperwork has NO (zero) classification. We are civilian pilots working for a civilian contractor with no security clearances, even though the unit is police. This letter was sent to us. Before we start trying to crucify people, I will bet that the press office have already briefed the local papers what will be happening and who is participating. If there is a lesson to be learned, then criticise who released this, not who posted details of an open letter.