Soldiers assigned to an engineer regiment under the PLA Xinjiang Military Command provide security during a bridge-building training exercise at the foot of the Tianshan Mountains on February 3, 2021. The troops completed the construction of a 23-meter-long bridge in just 10 minutes under the extreme cold conditions of minus 18 degrees Celsius.(eng.chinamil.com.cn/Photo by Li Zhiqiang)

Soldiers assigned to an engineer regiment under the PLA Xinjiang Military Command operate a snow removal machine to clear the path prior to a bridge-building training exercise at the foot of the Tianshan Mountains on February 3, 2021. The troops completed the construction of a 23-meter-long bridge in just 10 minutes under the extreme cold conditions of minus 18 degrees Celsius. (eng.chinamil.com.cn/Photo by Li Zhiqiang)

Soldiers assigned to an engineer regiment under the PLA Xinjiang Military Command deploy the Rapidly Emplaced Bridge System (REBS) during a bridge-building training exercise at the foot of the Tianshan Mountains on February 3, 2021. The vehicle-mounted REB is 23-meter long. Under the extreme cold conditions of minus 18 degrees Celsius, it took only 10 minutes for the troops to complete the bridging operation. (eng.chinamil.com.cn/Photo by Li Zhiqiang)

Soldiers assigned to an engineer regiment under the PLA Xinjiang Military Command deploy the Rapidly Emplaced Bridge System (REBS) during a bridge-building training exercise at the foot of the Tianshan Mountains on February 3, 2021. The vehicle-mounted REB is 23-meter long. Under the extreme cold conditions of minus 18 degrees Celsius, it took only 10 minutes for the troops to complete the bridging operation. (eng.chinamil.com.cn/Photo by Li Zhiqiang)