A combat regiment, the 3rd Foreign Infantry Regiment (3e REI) is organized around four companies with different structures: a command and support company (which includes the SAED and the equatorial forest training center), two combat companies, and a support company. In addition, the regiment has a reserve company. Permanently in an operational posture as part of the HARPIE missions (fight against illegal gold mining) and TITAN (protection of the CSG), the regiment can be deployed across the South American subcontinent. This was the case recently, in September 2017, to assist victims of Hurricane Irma in Saint‑Martin. Composed of both legionnaires and regular army units, it specializes in combat in the equatorial forest. Its main mission is to ensure the surveillance of the CSG (Guiana Space Center) during rocket launches. It is then deployed all around the center to protect the site.

The most recent of the Foreign Legion’s formations (2007), the Foreign Legion Recruiting Group (GRLE) is an integral part of the Legion’s foundation. Its headquarters is stationed at Fort de Nogent in Fontenay-sous-Bois, while the ten Foreign Legion Information Posts (PILE) recruit across the entire metropolitan national territory from France’s largest cities. Since 30 April 2018, the GRLE has been the regiment entrusted with the traditions and Memory of the 11th Foreign Infantry Regiment, having been given custody of its colors.

An assault engineer unit, the 1st Foreign Engineer Regiment was created in 1984 under the name 6th Foreign Engineer Regiment (6e REG). It became the 1st REG in 1999, when a second Foreign Legion engineer regiment was established. It carries out missions in mobility support, counter-mobility, and emergency deployment support. It is also capable of direct participation in close combat, notably within the framework of amphibious operations.