
The Mexican Armed Forces are composed of two independent entities: the Mexican Army and the Mexican Navy. The Mexican Army includes the Mexican Air Force (FAM). The Special Forces are part of the Army while the Presidential Guard and Military Police fall under the National Guard, but have their own chain of command. The Mexican Navy includes the Naval Infantry Force and the Naval Aviation (FAN).

The Mexican Army is the combined land and air branch and is the largest of the Mexican Armed Forces; it is also known as the National Defense Army.

The Mexican Armed Forces have a number of bugle and trumpet calls for the different branches. Drums and bugles are used to signal the various calls for most units of the Army, Navy and Air Force while the cavalry trumpet is used to signal calls for the cavalry units of the Army, Army artillery units and the Air Force. Many of the calls and signals listed below are also used by civilian drum and bugle bands.

The Estado Mayor Presidencial — EMP was the institution charged with protecting and safeguarding the President of Mexico, the First Lady of Mexico and their immediate families. It is described in its regulations as a techno-military organism and an administrative unit of the Presidency of the Republic of Mexico in facilitating the President's fulfillment of his attributes and functions.

The Mexican Air Force is the primary aerial warfare service branch of the Mexican Armed Forces. It is a component of the Mexican Army and depends on the National Defense Secretariat (SEDENA). The objective of the FAM is to defend the integrity, independence, and sovereignty of Mexico. Its auxiliary tasks include internal security, assisting with public works, and natural disaster management. Since December 2017, its commander is Miguel Enrique Vallín Osuna.

The Mexican Navy is one of the two independent armed forces of Mexico. The actual naval forces are called the Armada de México. The Secretaría de Marina (SEMAR) includes both the Armada itself and the attached ministerial and civil service. The commander of the Navy is the Secretary of the Navy, who is both a cabinet minister and a career naval officer.

Mexico is one of the few countries which has technical capabilities to manufacture nuclear weapons. However it has renounced them and pledged to only use its nuclear technology for peaceful purposes following the Treaty of Tlatelolco in 1968. In the 1970s Mexico's national institute for nuclear research successfully achieved the creation of highly enriched uranium which is used in nuclear power plants and in the construction of nuclear weapons. However the country agreed in 2012 to downgrade the high enriched uranium used on its nuclear power plants to low enriched uranium, the process was realised with the assistance of the International Atomic Energy Agency. It is unknown if Mexico ever created or possessed nuclear or any other kind of mass destruction weapons.

The National Guard is a Mexican gendarmerie with national police functions created in 2019. The National Guard was formed by absorbing units and officers from the Federal Police, Military Police, and Naval Police.

The Plan DN-III-E or Civil Relief and Aid Plan for Disasters is a series of measures implemented primarily by the Mexican Secretariat of National Defense, specifically the Mexican Army and the Mexican Air Force organized as a body under the name of Support Force for Disaster (FACD). This acts in response to a disastrous situation that affects or could affect a large group of civilians in Mexico and, in some cases, abroad. It is also known as the 3rd Army mission entrusted to safeguard and protect civilians in case of disaster.
The Representative Music Band of the Mexican Armed Forces is a Mexican military band which is currently led by Agripino Centeno Blanco, who serves as bandleader and director of music. As the more senior band of the Mexican Armed Forces personnel are qualified musicians from all branches of the Armed Forces, and thus the band is under the command of both the Secretariat of National Defense and the Secretariat of the Navy.