N. Korean army gives brutal show of 'strength, bravery and morale'

North Korean leader Kim Jong Un overseas an extreme martial arts demonstration in which a row of men -- some shirtless and some in full military uniform -- punch through layers of concrete bricks or use their heads or hands to break them. The display, broadcast by state-run station KCTV on Tuesday, marked the opening of an weapons exhibition in Pyongyang that included aerobatic flights.

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