North Korean leader Kim Jong-un watches a military training exercise. State media said Kim was supervising general tactical exercises of the Korean People's Army Combined Unit 655. The Army is celebrating it's 80th anniversary since being founded as an anti-Japanese occupation guerrilla force. It's widely recognised as the fourth largest army in the world. Kim called on soldiers attending the training to 'mercilessly wipe out the enemies with the arms of justice and revenge if they provoke.'