Well, this helps a helluva lot,

doesn't it?
Officers seized more than 6 tons of marijuana, about 145 pounds of cocaine, 12 automatic and semi-automatic weapons, thousands of rounds of ammunition, grenades, body armor and camouflage netting during two raids in McAllen on Wednesday, [Police Chief Victor] Rodriguez said . . .

Much of what officials seized was allegedly provided to the group, which claimed to be working with the Gulf Cartel in Reynosa, by Guardsman Jose Francisco Padilla, 30, of San Juan, police said.

“(Padilla) is a source of the flak equipment … .30-caliber weapons and ammunition,” Rodriguez said. “We know he is an active National Guardsman, but I don’t know what his assignment is.”
Apparently "Steal stuff and sell it", from the sound of this.

Found at Sipsey Street, who also notes that Sen. Coburn has taken notice of Project Gunwalker.