Question:
Where was Antoine Compagnon educated in Mar, 1969?

Context:
 Antoine Compagnon attended Prytanée National Militaire from Jan, 1965 to Jan, 1970. 
 Antoine Compagnon attended École des Ponts ParisTech from Jan, 1973 to Jan, 1975. 
 Antoine Compagnon attended École polytechnique from Jan, 1970 to Jan, 1973.

Answer:
Prytanée National Militaire