The Mexican Army (Spanish: Ejército Mexicano) is the combined land and air branch and largest of the Mexican Armed Forces; it is also known as the National Defense Army.It was the first army to adopt (1908) and use (1910) a self-loading rifle, the Mondragón rifle. The Mexican Army has an active duty force of 267,506 (2014 est.).Mexico has no major foreign nation-state adversaries.