In Die Hard 2, a US military unit consisting of at least a dozen soldiers engages in several treasonous acts, from murdering one of their own to freeing an international criminal to helping crash a commercial airliner, killing hundreds of Americans at Christmas. The unit's goal is to make a lot of money, with its members presumably planning to live outside the US for the rest of their lives.
In real life, has any US military unit or other substantial group of active-duty soldiers ever attempted any treasonous plots of similar gravity to what's depicted in Die Hard 2? Or would the premeditated involvement of so many soldiers in such heinous acts be unprecedented in US military history?
Los Zetas might be one of these. They are a Mexican drugs cartel. From Wikipedia: "The origins of Los Zetas date back to the late 1990s when commandos of the Mexican Army deserted their ranks and began working as the enforcement arm of the Gulf Cartel."