Jon Chol Jin / AP University students punch the air as they march through Kim Il Sung Square in downtown Pyongyang, North Korea, on March 29, 2013.

Jon Chol Jin / AP

Tens of thousands of North Koreans turned out for a mass rally at the main square in Pyongyang on Friday in support of their leader Kim Jong Un's call to arms.

Placards read "Let's crush the puppet traitor group" and "Let's rip the puppet traitors to death!", The Associated Press reported.

Earlier on Friday, the isolated communist state put its rocket units on standby to attack U.S. military bases in South Korea and the Pacific, Reuters reported, after two nuclear-capable stealth bombers flew from Missouri to drop inert munitions on a range in South Korea as part of a major military exercise.

KCNA via EPA A picture released by the North Korean Central News Agency (KCNA) shows Kim Jong Un convening an urgent operation meeting at 0:30 am on March 29, 2013 at an undisclosed location, in which he ordered strategic rocket forces to be on standby to strike US and South Korean targets at any time.

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Military members and civilians rallied in Pyongyang on Friday as it was announced that the Korean People's Army is combat-ready to strike bases in the U.S. as well as targets in South Korea. NBCNews.com's Dara Brown reports.