@Tw0Cr0ws
Isn't the Mexican military a wholly owned subsidiary of the drug cartels?
Short answer;
Not wholly owned. Not even the majority. However, there are enough that corruption is considered rampant. I've spent close to three years living and working in Mexico. My observation/information was that it came down to geography.
The last run there, it was the states of Baja California, Chihuahua, Chiapas, Michoacán, Nuevo León, Oaxaca, and Sinaloa that were suffering the most.
Long answer;
When Felipe Calderón declared his war on drugs, he attempted to bring in troops from states not on that list into the states on the list. That got a few hundred people killed. The first shot of which was Operation Michoacán. It got ~50 troops, ~150 officers, and 500 civilians killed. Of the civilians, less than 100 were cartel.
That was from just one state. It also clearly demonstrated that not all of their military was/is corrupted.