Juarez Staff Sgt . Ciudad Juarez shot with 5 others in David Booher . CNN 's Mayra Cuevas-Nazario , Mike Mount , Dave Alsup and Mariano Castillo contributed to this report . Gunmen appeared to have targeted the victims , American spokesman says . Air Force is considered off-limits for the U.S. military because of drug violence .
Juarez Staff Sgt . Ciudad Juarez shot with 5 others in David Booher . Gunmen appeared to have targeted the victims , American spokesman says . Air Force is considered off-limits for the U.S. military because of drug violence .