 He was also questioned in the case of the disappearances of two French nuns, Alice Domon and Léonie Duquet, in which Alfredo Astiz (alias "Angel of Death") is also being prosecuted.Two weeks before the military coup d'état of March 24, 1976, Luis María Mendía gathered naval officers on March 10, under the orders of Admiral and head of military forces Emilio Massera, to prepare the repression against subversive delinquents.On March 24, the day of the coup, he held another meeting, at which he theorized about the tactics used during the Dirty War, including the use of torture and of death flights.