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A campsite for one soldier. Used as a temporary spawn point near borders. Decays very rapidly.
In-game description

A Campsite is a small, personal version of a Forward Base. It acts as a very short-term spawn point for a single player only. Only one player is allowed to set their spawn there. A Campsite only has one storage slot that should be used for S. Supplies; any other item put inside will render it useless. They decay rather quickly; therefore it is recommended to only store a small number of S. Supplies in it.

Campsites can only be built near region borders. As such, their main purpose is to assist large assaults when travelling into another region. The Campsites serve as temporary spawn points while a more permanent Forward Base is built to support the assault.