== Unusual or rare applications of armour == 

  
 - In World War One improvised armour was used in trench warfare (including reinforced helmets, and in the case of some German units, breastplates) 
 - In the Great Patriotic War a number of units of Soviet shock-troopers were equipped with steel breastplates 
 - The aircraft armour section could be expanded with a discussion between the three facets: Durability, redundancy and armour. Some examples such as the Ilyushin Il-2 and the Junkers J.1 might also be appropriate.