The mission of the regiment revolves around the protection of the Guiana Space Centre (). Prior and before each space launch, under a prefectoral requisition at the corps of an inter-armed contingent, the 3rd Foreign Infantry Regiment conducts search reconnaissance patrols in the exterior zones around the launching area in order to prevent any compromising intrusion. Each planetary space launch requires the prevention deployment of 2-3 combat companies. Simultaneously, the regiment also ensures the defense of the sensitive installations in relation to the launch site towards low altitude aerial threats by the CA (Compagnie d'Appui). End of 2011, the Guiana Space Center, integrated the Soyouz and Vega launchers, to which the 3rd Foreign Infantry Regiment would ensure the usual front line surrounding protection.