At the sound of an emergency announcement, the squad quickly moves into position.
One by one, soldiers pick up their rifles, stream out and jump onto the vehicle.
Everything must take less than five minutes from the sound of the alarm until the vehicle moves out of the gate.
This is a typical scene for those serving in Korea's army and the Chuseok holiday does not offer a break.
Soldiers go through physical training during the day - running in single file lines, trying to beat the lingering autumn heat.
A regular live-fire exercise is also included in the daily routine - safety and precision is key.
But it's not all work and no play on the day of Chuseok.
Soldiers get into the holiday spirit and play the traditional Korean board game 'Yut' - a board game played by many Korean families on the day of the traditional holiday.
[Interview : Cha Min-Jong, Private 1st Class
5th Division, ROK Army] "It's my first time spending Chuseok without my family, but people here are friendly and I am used to the environment, so I think I'll be alright."
There is no better way to keep in touch with your loved ones than through a hand-written letter, but nowadays, it is more common to make phone calls.
Those serving in the military can even make video calls to their parents with the help of their senior officers.
[Interview : Kim Han-ul, email@example.com
ed:mark] "Meanwhile, it's business as usual on the nation's frontline, as troops continue to keep a close watch on the border all throughout the year."
Another day goes by, with soldiers administrating careful checks of the border.
Soldiers check their gear and load their ammunition before heading out to the general observation posts at the inter-Korean border.
These soldiers guard their posts on rotation 24 hours a day, 7 days a week, keeping a close watch on any suspicious movements from the North.
As families celebrate one of nation's two largest festivities during the year, these soliders are serving behind the scenes to keep the nation safe and strong even during the holiday season.
Kim Han-ul, Arirang News, Yeoncheon.