Secretaría de la Defensa Nacional

The Secretaría de la Defensa Nacional (SEDENA) is the Mexican government ministry responsible for the administration and operational command of the Mexican Army and the Mexican Air Force. Its core mission is to defend national sovereignty, territorial integrity, and the constitutional order through the preparation and employment of land and air forces. In addition to conventional defense duties, SEDENA contributes to internal security operations, disaster relief efforts, and humanitarian assistance when civil authorities request military support. The ministry also oversees military logistics, infrastructure development, and the management of defense‑related installations across the country. Through its engineering units, SEDENA participates in national projects such as the construction and maintenance of transportation corridors, including aspects of the Tren Maya railway. These activities place the ministry at the intersection of defense, public works, and civil protection.

SEDENA operates as a civilian‑led ministry within the federal executive branch, with the Secretary of National Defense appointed by the President of Mexico and typically drawn from senior military ranks. While it directs the Army and Air Force, the Mexican Navy falls under a separate secretariat, the Secretaría de Marina, creating a divided but coordinated structure for the nation’s armed forces. The ministry holds regulatory authority over military discipline, justice, and procurement, giving it a distinctive role that blends operational command with administrative oversight. Its notable competencies include large‑scale logistics, combat engineering, and intelligence gathering, which were highlighted when the 2022 Guacamaya cyberattack exposed internal communications and surveillance capabilities. The breach demonstrated both the reach of SEDENA’s digital assets and the vulnerabilities inherent in its information systems. As a central institution of Mexico’s security architecture, SEDENA remains accountable to the President and, ultimately, to the Mexican citizenry for the fulfillment of its defense and support mandates.