The thing to consider here is the "Zeta factor."
"Zeta" is the mexican nickname for one of several groups composed of ex- and current members of the Mexican army known for doing heavy muscle work for the various drug cartels operating on Mexico's northern and southern borders. They're "broken arrows," corrupted soldiers doing "merc work" on the side. Several incidents of these nasties crossing into the U.S. with armed vehicles have been recorded, as have automatic-weapons fire directed with some skill against Border Patrol personnel and vehicles.
Are they technically Mexican military? Yes. Are they acting on -orders- from the Mexican army? No. It's just your basic Latin American death-squad killing for hire. They're dangerous as Hell, but nothing official.
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