The Cuerpo de Infantería de Marina (Naval Marine Corps) is the naval infantry branch of the Mexican Navy, responsible for the country’s maritime security and internal and external defense. Founded in the early 19th century, it has evolved into a structured force with 30 Naval Infantry Battalions, several special battalions, and special forces groups. They are trained to perform various operations, including amphibious assault, air assault, reconnaissance, and immediate response. The corps also provides training for officers, marines, and combat specialists. 

Key Points: 

1. The Mexican Naval Marine Corps was established in the 19th century following the Declaration of Independence. It was legally established as a war corps in 1924 and has evolved with updated training and organization.
2. The corps is trained to perform various tasks, including amphibious and air assault, reconnaissance, urban combat, combat support, and immediate emergency response. They also handle port security, the protection of coastal areas, and patrolling major waterways.
3. The corps’ organization includes 30 Naval Infantry Battalions organized into regional Brigades. Additionally, there are special battalions and groups, including a Presidential Guard Battalion, Parachute Fusilier Battalion, Marine Amphibious Groups, and Special Forces Groups.
4. The corps is managed by the Secretariat of the Navy (SEMAR), independent of the Secretariat of National Defense (SEDENA), the department responsible for the Mexican Army and Air Force.
5. Training within the corps is comprehensive, offering multiple specializations such as Ground Combatant, Machine Gunner, Combat Nurse, Tracker, Mortarman, and others. Marines can also access additional training courses, which enhance their skills and knowledge in their respective fields.

Source: https://greydynamics.com/cuerpo-de-infanteria-de-marina-the-mexican-marines/