Here’s an interesting Order published at Goodfellow AFB, which prohibits military personnel assigned to the 17th Training Wing from traveling to certain parts of Mexico.
[T]he border areas of Mexico, including Tijuana, Nogales, Juarez, Nuevo Laredo, Acuna, Piedras Negras, and Reynosa/Matamoros.
All active duty members, reservists and guardsmen in Title 10 status, attached to the 17 TRW and tenant units are prohibited from traveling to these affected areas. All other 17 TRW personnel, including guardsmen in Title 32 status, DOD civilian employees, contractors and family members are strongly discouraged against travel to these areas of Mexico.