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.

US Military Base Synonymous With Being Impregnable - Australia CodyCross Answers | CodyCross Solutions