Base Inside Enemy Lines, Soldiers Fly in and Out

This page is the CodyCross answer for the clue below from The 1950s, Group 1802, Puzzle 4 (Queen Elizabeth).

Question is: Base Inside Enemy Lines, Soldiers Fly in and Out

and the answer is: AIRHEAD

Word Meaning:

AIRHEAD — (military) An area of hostile territory that has been seized for use as an airbase to ensure the further safe landing of troops and materiel.

Definitions from Wiktionary.