Sky News was given special access to film both the joint spring exercises and regular training ahead of this week’s historic summit.
We watched as troops on a nine month rotation from their US bases did tank drills to familiarise themselves with the terrain.
Lieutenant Corporal Bill Coryell said they must be prepared for anything.
The motto of the second infantry division is, we fight tonight, which means we’re always ready to go, he said.
Korea at war – why they are divided
In the past, North Korea has frequently complained about the presence of the 28,500 American personnel on the peninsula, suggesting they are a threat to security.
No panic in Singapore as summit approaches
However, both US president Donald Trump and his defence secretary James Mattis have said their withdrawal will not be up for discussion during the Singapore summit.
Despite these assurances, conservative analysts in Seoul believe that any peace deal would eventually grant Pyongyang its wish, potentially leaving South Korea exposed.
Professor Taewoo Kim from Konyang University said Kim Jong Un doesn’t need to demand the removal of troops because once they sign a peace treaty with the US the demand will arise naturally in South Korean people.
North Korea has the fourth largest military in the world, with around 1.1 million soldiers in the infantry alone.
US troops have to train in chemical weapons suits, knowing a real battle could involve some of the deadliest weapons on earth.
Your guide to the Trump-Kim summit
As excitement builds ahead of the Singapore summit, it is business as usual on the US base.
Colonel Scott Taylor of the 8th Army said Although peace hopefully is breaking out here on the peninsula, the reality is that we have to be prepared should it reverse and so we’re not going to stop preparing to deter that war.
Frankly, the military instrument of national power provides the decision space for the diplomacy to succeed.
We are very hopeful.
Trump and Kim body language
The presence of American forces on the peninsula is a stumbling block on the path to peace.
Joint drills with South Korea enraged Kim Jong Un who threatened to cancel his meeting with Mr Trump.
The South Korean military recently said Seoul and Washington wouldn’t publicise future joint military drills but denied it would scale down or cancel future exercises.
News Source SkyNews