A Chinese participant conducts fast-rope training from a transport helicopter during the Cobra Gold-2020 joint military exercise at the national disaster relief training center in Chachoengsao Province, Thailand from February 25 to March 6, 2020. Over 200 troops from seven countries including China, Thailand and the US participated in the drill. (eng.chinamil.com.cn/Photo by Luo Shidong)

Military members from various countries jointly set up the lower fulcrum for a simulated wounded evacuation mission during the humanitarian assistance disaster relief field training exercise (HADR FTX), as part of the Cobra Gold-2020 joint military exercise, at the national disaster relief training center in Chachoengsao Province, Thailand from February 25 to March 6, 2020. Over 200 troops from seven countries including China, Thailand and the US participated in the exercise. (eng.chinamil.com.cn/Photo by yin Bo)

A Chinese member operates a descent control device to evacuate the simulated wounded person with ropes from a high-rise building during the humanitarian assistance disaster relief field training drill as a part of the Cobra Gold-2020 joint military exercise at the national disaster relief training center in Chachoengsao Province, Thailand from February 25 to March 6, 2020. Over 200 troops from seven countries including China, Thailand and the US participated in the exercise. (eng.chinamil.com.cn/Photo by Yin Bo)

Participating troops from various countries jointly conduct rescue in a chest-deep puddle during the Cobra Gold-2020 joint military exercise at the national disaster relief training center in Chachoengsao Province, Thailand from February 25 to March 6, 2020. Over 200 troops from seven countries including China, Thailand and the US participated in the exercise. (eng.chinamil.com.cn/Photo by Huang Kang)

Chinese and foreign participants jointly set up the anchor point during the Cobra Gold-2020 joint military exercise at the national disaster relief training center in Chachoengsao Province, Thailand from February 25 to March 6, 2020. Over 200 troops from seven countries including China, Thailand and the US participated in the exercise. (eng.chinamil.com.cn/Photo by Huang Kang)

Representatives of the participating troops pose for a group photo during the Cobra Gold-2020 joint military exercise at the national disaster relief training center in Chachoengsao Province, Thailand from February 25 to March 6, 2020. (eng.chinamil.com.cn/Photo by Yin Bo)

Military members of the Chinese engineering contingent pose for a group photo during the annual Cobra Gold joint military exercise at the national disaster relief training center in Chachoengsao Province, Thailand from February 25 to March 6, 2020. (eng.chinamil.com.cn/Photo by Zhang Zhengju)