Time Was is a time travel romance novella by British author Ian McDonald, published on 24 April 2018 by Tor Books.
US President Donald Trump has refused to lift sanctions over the country's nuclear programme.
The wrongly broadcast siren reportedly "riled up" troops at The Base and some were seen running in full uniform, according to an online post cited by the Washington Post newspaper.
Spokesman Lt Col Martyn Crighton said he could not verify whether the video was of Thursday's incident.
Soldiers were quickly notified of the mistake, Lt Col Crighton said.
The strategically important base is near The South Korean town of Dongducheon about 60km (40 miles) north of The South Korean capital Seoul. It covers More Than 10 sq km and is home to several thousand US troops.Why are Korean Peninsula tensions rising?
Earlier in December, North Korean Deputy Foreign Minister Ri Thae Song hinted that Pyongyang could resume long-range missile tests if Washington refused to change its negotiating position.
It was "entirely up to the US what Christmas gift it will select", he said at the time.
Last month, Japan condemned Pyongyang for "repeated launches of ballistic missiles" after two projectiles were fired.
The North however said it was testing a "super-large multiple-rocket launcher", and threatened that.
The President made pursuing diplomacy with North Korea a centre-piece of his foreign policy agenda in 2018 but has failed to extract significant concessions on denuclearisation despite holding two summits with leader Kim Jong-un and even briefly setting foot in North Korea .