MS-13 members are increasing their presence on US military installations, by the way. It's a great way to receive combat training. As are the Bloods, Crips, Black Disciples, Gangster Disciples, Hells Angels, Latin Kings, The 18th Street Gang, Mexican Mafia, Nortenos, Surenos, Vice Lords, and various white supremacist groups.
Here ya go -
Is Gang Activity Increasing in the U.S. Military?
Many of these people aren't enlisting for duty, honor, country. They're enlisting to learn how to fight rival gangs and how to run their gang organizations in military fashion. And they bring all sorts of crime with them when they enlist. Drugs, homicide, assault, weapons charges, etc.
They don't give a rat's ass about your freedom or your livelihood. And this ain't 1776, boys. Those days are long gone.