This is the 1177th most frequent Russian word.
военная
"Военная" means "military" or "relating to the armed forces."
The word "военная" functions as an adjective related to military matters, modifying the noun "техника" (equipment).
Военная техника играет важную роль в современной армии.
Military equipment plays an important role in the modern army.
Here, "военная" is used as a noun referring to a female soldier or someone serving in the military.
Она была военная и служила в морской пехоте.
She was a military personnel and served in the naval infantry.
The word "военной" is used as an adjective, in its genitive case, to describe the delegation associated with military affairs.