This paper investigates changes in the French parliament's role in the control of military missions, introduced by the 2008 constitutional reform, and examines their effects on practices of parliamentary control and legislative–executive interactions. The paper analyses how the constitutional changes have developed; the attitudes of parliamentarians towards control; the knowledges they relate to legislative-executive relations; and the post-reform practice of parliamentary control of French military missions. Although legislative–executive relations with regard to military missions have been recalibrated and formalised, they have not fundamentally challenged the executive's lead. Reasons include a strong belief in the need for effectiveness, acceptance of the institutional order, and a foreign policy culture of executive leadership. French parliamentarians value their new powers, but mostly do not seek their further extension.