US Military Base Synonymous With Being Impregnable
This page is the CodyCross answer for the clue below from Australia, Group 1004, Puzzle 2 (Aussie Meat Pie).
Question is: US Military Base Synonymous With Being Impregnable
and the answer is: FORTKNOX
Word Meaning:
FORT — A fortified defensive structure stationed with troops.
Definitions from Wiktionary.