Many pilots were initially seconded to the RFC from their original regiments by becoming an observer. Some RFC ground crew (often NCO's or below) also volunteered for these flying duties as they then received supplementary flying pay. There was no formal training for observers until 1917 and many were sent on their first sortie with only a brief introduction to the aircraft from the pilot. Once certified as fully qualified the observer was awarded the coveted half-wing brevet. Once awarded this could not be forfeited so it essentially amounted to a decoration. Originally in the RFC, as in most early air forces, the observer was nominally in command of the aircraft with the pilot having the role of a "chauffeur". In practice, this was reversed at an early stage in the RFC, so that the pilot normally commanded the aircraft. Most operational two seaters of the period did not have dual controls (an exception was the F.K. 8), so that the death or incapacity of the pilot normally meant an inevitable crash – but nonetheless many observers gained at least rudimentary piloting skills, and it was very common for experienced observers to be selected for pilot training.