One of the command's exercises in the 1950s was Operation Counter Punch. Counter Punch was a September 1957 AFCENT air-ground military exercise that also tested NATO's integrated air-defense system in its central European front. The exercise involved the national air-defense systems of Britain, France, Belgium and the Netherlands, with Général d'Armée Jean-Étienne Valluy, French Army, NATO's Commander-in-Chief Allied Forces Central Europe (CINCENT), in overall command. Operation Counter Punch revealed deficiencies in the Integrated NATO Air Defense System as well as air force responsiveness to theoretical Soviet and Warsaw Pact ground advances.