31st Brigada de Infantería Mecanizada

​ I/14 Mechanized Infantry Battalion Tarragona

II/14 Mechanized Infantry Battalion Guadalajara 

Advanced

​Assault

31st Brigada de Infantería Mecanizada

Hq 31st Mechanized Infantry Brigade

31st Ingenieros Company

31st Anti-tank Company

31st Logistics Group

31st Field Artillery Group

31st Brigada de Infantería Mecanizada

​ III/21 Mechanized Infantry Battalion Barbastro

IV/21 Armor Battalion Otumba