Mars On The River Drina: NATO
(click song title to hear comparison)

This is a cover of Stanislav Binički's 'Marš na Drinu', a song honouring the Serbian efforts at the Battle of Cer during WWI. This tune/song is closely associated with Serbian nationalism and is sometimes chanted at football matches.
Despite not having the original lyrics about war, sacrifice, blood, and bravery, Laibach's version is darker, mysterious, and more powerful than any of the other renditions that I have heard. This comparison has Baja Kali Knindza, singing the original.

Laibach are not the only ones to cover this tune in there own way. Here are Belgium twangy guitar band The Jokers from 1963 with 'Drina March'.

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The Jokers, 1963, 'Drina March'