No. We had a period of reversing decisions in the mid-1990s. Certainly through all of my training it has always been a valid decision to be taken by the Canadian command that in certain circumstances the risk-benefit analysis may lead you to not display the Geneva symbols. You have to understand that by doing so you forfeit your protection under the Geneva Convention. It's not a war crime, but the medical personnel forfeit their ability to be treated differently if they are captured during operations.
On November 27th, 2006. See this statement in context.