Well, depends from area to area. After the war, my late friend, seen gipsy house with fence made from P-38 Lighning parts. In most cases people dismantle all they can, rest is remained to rust and roten. Military remove supistous objects, which can include explosive, some are brought to melt facility but in most cases drop. Sample- after WW2 British plan to bring back home all airplaners, enemy and own, and melt em into aluminum. But they give up after calculations show that new produced aluminum cost 0,5 BP (per pound if I can remember well) and recicled from ex aitplanes cost 1 BP! So decision was clear- drop in sea or simply trown it in some hole in ground and cover with dozers.
