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Aircraft carrier
Maginot Line
Anti-aircraft warfare
Sai (weapon)
Rook (chess)
Battle of Alesia
Japanese battleship Mikasa
Armoured fighting vehicle
Benin Moat
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Armour
Udaloy-class destroyer
Caltrop
First Battle of El Alamein
Steregushchiy-class corvette
Bishop (chess)
North American porcupine
Vedalam
Bear spray
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National security
Karakurt-class corvette
S-mine
Char B1
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