We've worried about homeland security for decades...
...but, quite frankly, we're damned good at it!
OK, maybe we haven't produced an invisibility device/formula...yet, but we Americans can handle anything terrorists (religious or political) can throw at us, as this never-reprinted Silver Age story from Harvey's Alarming Tales #4 (1958) shows!
BTW, it's written by Jack Oleck (a talented novelist and comic book writer who was the brother-in-law of Alarming Tales editor Joe Simon) and illustrated by Johnny Quest's co-creator Doug Wildey!