This is the 2328th most frequent Polish word.
wojskowej
"Military" (adjective form, relating to the military).
Here, 'wojskowej' is the adjectival form modifying 'strefy', indicating the nature of the zone, i.e., the military.
Część osiedla znajduje się obok strefy wojskowej.
Part of the housing estate is located next to the military zone.
The word 'wojskowej' serves as an adjective describing 'armii,' emphasizing its military aspect.
Książka opisuje historię polskiej armii wojskowej.
The book describes the history of the Polish military army.
In this example, 'wojskowa' describes 'droga', referring to its function or association being of military origin.