Editing Concealment device (section)

===Ammunition===
Starting in the [[First World War]] and still continuing today, military personnel use [[ammunition]] casings to hide small amounts of critical information{{cn|date=April 2024}} e.g. encryption/recognition codes or navigational grid references etc. The hiding place is very easy to prepare: the bullet is removed from the [[Cartridge (firearms)|cartridge]] and the propellant powder poured away. A small piece of paper with writing on it can be stored inside. Given that ammunition can be found everywhere in a combat zone, it is very easy to hide or discard such items because they blend in easily. Similarly, if a soldier is captured, the enemy expects that soldiers will have ammunition in their pockets, so little attention is paid, beyond confiscating and discarding it.