defense area

perimeter defense (all-around defense)

beach defense mine / beach-defense mine

air defense area

area air defense

area air defense commander (AADC)

area defense

ballistic missile defense area

battalion defense area

forward defense area

main defense area (line) / main defensive position

rear area protection and defense

sea area defense

forward area air defense command, control, communications and intelligence (FAAD C3I)

base area defense ground environment

ground defense area

company defense area

squad defense area

local area defense missile (LADM)

main defense (line) area

area of war/war area

potential danger area (trouble area)

hazard area / hazardous area

killing area / kill area

open area danger area

active layered theatre (ballistic) missile defense (ALTBMD)

aerospace defense command

air defense (AD)

Air defense and Airspace Management Directorate (NATO)

air defense artillery (ADA)

air defense artillery battalion

air defense artillery system

air defense brigade