We invested much time and material in the fences and a high watchtower at our airfield-base. Most were equipped with camouflage nets, metal plates and wires, also the watchtower. Now many segments and the tower disappeared bit by bit. If you look at the condition of the remaining fences flawless is displayed, so i don´t think all the others disapperance ist caused by a natural death ;-)
Finally I would say that it´s not very funny that somethings disappears in which you spent many, many time...