Mexican Military

The Mexican military is the name given to the combined military forces of Mexico. So far, only ships of the Mexican Navy have been seen onscreen.

Fear the Walking Dead
In the episode Blood in the Streets, both Victor and Luis state that they have a contact who can help them get past the boarder and into Mexico. In the following episode, it is revealed that their contact is a member of the Mexican Navy, who is part of a small flotilla patrolling the coastal waters around Strand's intended destination. They open fire on the Abigail after the gunfight between Luis and his contact.

From the conversation Strand and Luis had with their contact, it appears that the main aim of the flotilla that greeted the Abigail appears to be to keep infected ships from making landfall on Mexico's coast. It can be implied that the army is engaged in stopping the infected crossing over the boarder from the United States, since George Geary, mentions that Mexico had sealed its boarders with the U.S. This may account for the lack of soldiers present after Strand and the others got onto land.