Designer" Ken Adam (qv), the jet pack  that Bond uses to escape his enemies was no nice special effect but  a real jet pack provided by the US Air Force. Initially  Sean Connery (qv) was to fly the jet pack without a helmet (and  some publicity photos of him with the jet pack were made with him  without a helmet). This was because he would have looked more  debonair. It was later decided he wear a helmet in the scene. This  was for risk / safety reasons as the pilot refused not to wear a  crash helmet and the scenes had to match.