Mexico’s security landscape has shifted sharply following the death of Nemesio Oseguera Cervantes, better known as El Mencho, leader of theJalisco New Generation Cartel(CJNG). The February 22 operation in Tapalpa was described by officials as a decisive strike against one of the country’s most powerful criminal figures. Yet attention has quickly turned to CJNG’s internal structure, particularly its elite enforcement arm known as Grupo Delta or Los Deltas.
Grupo Delta is widely described by investigators as a specialised operational cell within CJNG. Its name is seen as a deliberate nod to the US Delta Force, signalling a paramilitary posture rather than a conventional trafficking outfit. Security officials say the unit is deployed for targeted “decapitation” strikes, high-profile assassinations and retaliation missions.
Los Deltas first came into official focus in 2018 when authorities in Jalisco detained four alleged members. The group gained broader notoriety after being linked in reporting to the assassination of former Jalisco governor Aristóteles Sandoval in Puerto Vallarta. The killing was described as a highly organised ambush involving disciplined gunmen and coordinated escape logistics.
Investigators have also connected the Delta Unit to other targeted killings, including that of businessman Felipe Tomé. When a figure known as “Delta 1” was arrested in 2020, authorities seized weapons, communications equipment, vehicles and financial assets. Officials said the cache indicated dedicated logistics and operational autonomy within the wider Jalisco New Generation Cartel hierarchy.
CJNG has repeatedly demonstrated the capacity for complex armed confrontations. In June 2020, cartel gunmen ambushed then-Mexico City police chief Omar García Harfuch, riddling his vehicle with bullets and killing two bodyguards and a bystander. Harfuch survived and publicly blamed El Mencho for the attack.
TheEl Mencho operationin Tapalpa triggered immediate unrest across Jalisco and neighbouring states. Cartel elements set up roadblocks, torched vehicles and engaged security forces, disrupting transport corridors and commercial activity. On one hand, emergency advisories have urged residents and foreign nationals to shelter in place as authorities sought to stabilise affected areas. On the other, CJNG has announced that anyone seen on the streets will be a legitimate target.
The Mexican army killed the leader of the Jalisco New Generation Cartel, Nemesio Rubén Oseguera Cervantes, “El Mencho,” on Sunday.
Security planners now face the challenge of preventing Grupo Delta-style cells from regrouping under new leadership. History has proven that removing a cartel leader does not automatically dismantle decentralised operational units. Cells such as Los Deltas can splinter, operate independently or align with emerging commanders.
CJNG’s structure is often described as modular, allowing it to absorb leadership losses while maintaining field capability. The existence of Grupo Delta underscores how the cartel blends criminal enterprise with battlefield-style tactics. For Mexican authorities, consolidating gains after the Tapalpa raid will require sustained intelligence mapping and disruption of specialised enforcement units.
Whether CJNG has been decisively weakened or merely reshaped remains uncertain. What is clear is that Grupo Delta symbolises a hardened phase of cartel militarisation. In the aftermath of El Mencho’s reported death, the battle for control and stability in Jalisco is far from over.
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