Helmet used by the Kosovo Liberation Army, 1999 (c)

During the late 1990s the Kosovo Liberation Army (KLA) waged a campaign of separatist violence against the Yugoslav security forces and ethnic Serbs from Kosovo which precipitated a Yugoslav military crackdown. The latter operation caused the displacement of thousands of ethnic Albanians, which in turn led to the Kosovo War (1998-1999) and military intervention by The North Atlantic Treaty Organisation (NATO).