J-16 fighter jets attached to an aviation brigade of the air force under the PLA Eastern Theater Command soar in the sky during an air battle training exercise on Feb.21, 2021.

An aircraft attached to an aviation regiment of the PLA Air Force takes off for flight training on February 20, 2021.

Mi-171 transport helicopters attached to an army aviation brigade under the PLA 72nd Group Army fly in formation during a flight training exercise on Feb.20, 2021.

Two J-10 fighter jets attached to a naval aviation brigade under the PLA Eastern Theater Command take off for the debut of 2021 annual training on February 20, 2021.

An antisubmarine patrol aircraft attached to a naval aviation regiment under the PLA Northern Theater Command soars into the sky and heads for the training airspace during the first flight training after Spring Festival holiday on February 20, 2021.

A J-10 fighter jet attached to an aviation brigade under the PLA Southern Theater Command takes off during the flight training exercise on Feb. 18, 2021, the first workday after the Spring Festival holiday.

A Y-8 anti-submarine warfare aircraft attached to a naval aviation regiment under the PLA Southern Theater Command soars into sky for a maritime patrol and anti-submarine training exercise on February 16, 2021.

A J-10 fighter jet attached to an aviation brigade of the air force under the PLA Northern Theater Command soars into the air during a flight training mission on February 18, 2021.

Two J-10 fighter jets attached to an aviation brigade of the air force under the PLA Southern Theater Command coordinated with each other as they take off for actual aerial combat training on February 1, 2021.

A cluster of attack and transport helicopters attached to an army aviation brigade under the PLA 76th Group Army conduct hover checks before leaving for a 24-hour flight task on February 2, 2021.

A pilot assigned to an aviation brigade of the air force under the PLA Southern Theater Command gets settled in the cockpit of his J-10 fighter jet during a sky patrol mission on January 31, 2021.

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.

Fighter jets attached to an aviation brigade of the air force under the PLA Southern Theater Command taxi under the guidance from the commanding tower during a round-the-clock flight training exercise on January 26, 2021.

Frontier defense soldiers assigned to a border defense regiment with the Shannan Military Sub-command under the PLA Tibet Military Command patrol the snow-blanketed border at the elevation of over 5,000 meters in Tibet Autonomous Region on January 23, 2021.

About 200,000 PAP troops stuck to their posts on Chinese New Year's Eve, faithfully performing their duties.

An Explosive Ordnance Disposal (EOD) soldier assigned to a barrier breaching company with a brigade under the PLA Navy Marine Corps demolishes a tilt-rod fuze, a device used to trigger anti-tank landmines, during a minesweeping training exercise in a minefield on January 29, 2021.

A ground crew member assigned to an aviation regiment of the PLA Air Force guides a fighter jet to taxi towards the take-off line during a night flight training mission.

A chartered flight carrying the first batch of the China-donated Sinopharm COVID-19 vaccines arrived in Cambodia on Sunday, welcomed by Prime Minister Samdech Techo Hun Sen at the Phnom Penh International Airport.

A ship-borne Z-8 transport helicopter attached to a landing ship flotilla with the navy under the PLA Southern Theater Command prepares to land on the flight deck of the amphibious dock landing ship Wuzhishan (Hull 987) on January 26, 2021.

Multi-type attack and transport helicopters attached to an army aviation brigade under the PLA 76th Group lift off and hover at an extremely low altitude during a flight training exercise on January 26, 2021. (eng.chinamil.com.cn/Photo by Wu Zhen)

The double-exposed shot shows a fighter jet silhouetted against a super full moon during a 24-hour flight training exercise from January 27 to 28, 2021. The jet is attached to an aviation regiment under the PLA Air Force.

A fighter jet attached to a naval aviation brigade of the air force under the PLA Eastern Theater Command takes off during a round-the-clock flight training exercise in mid January, 2021. (eng.chinamil.com.cn/Photo by Tian Jianmin)

The picture shows the icebreaker Haibing (Hull 722) attached to the PLA Navy navigates and breaks the ice in waters off the Liaodong Bay area on January 25, 2021. The icebreaker Haibing 722 was commissioned to the PLA Navy in January, 2016.

Fighter jets attached to an aviation brigade of the air force under the PLA Northern Theater Command fly in diamond formation during a realistic flight training exercise on January 12, 2020. (eng.chinamil.com.cn/Photo by Dai Ke)

A J-10 fighter jet attached to an aviation brigade of the air force under the PLA Southern Theater Command takes off from the runway during a flight training exercise on January 20, 2021.

The guided-missile frigate Changzhou (Hull 549) and the guided-missile destroyer Jinan (Hull 152) steam in formation in waters of the East China Sea during a maritime training exercise on January 20, 2021.

Ground crews assigned to a naval aviation brigade under the PLA Northern Theater Command perform inspections on a JH-7 fighter bomber in an aircraft hangar prior to a flight training exercise in early January, 2021.

A cluster of Z-9 attack helicopters attached to a detachment with the People's Armed Police (PAP) Force lift off simultaneously for a flight training mission in early January, 2021.(eng.chinamil.com.cn/Photo by Zhang Xi)

Paratroopers assigned to a brigade of the airborne troops under the PLA Air Force descend to the drop zone during an air-drop training exercise on January 16, 2021. (eng.chinamil.com.cn/Photo by Liu Bingbing)

Maintenance men assigned to an army aviation brigade under the PLA 72nd Group Army perform thorough inspections on a WZ-10 attack helicopter prior to a flight training exercise on January 14, 2021. (eng.chinamil.com.cn/Photo by Zhang Huanpeng)

Soldiers assigned to a brigade under the PLA 73rd Group Army drive the main battle tank uphill in mountainous area during a driving skills training exercise on January 15, 2021. (eng.chinamil.com.cn/Photo by Liu Zhiyong)

The guided-missile frigate Zhoushan (Hull 529), together with the guided-missile destroyers Taizhou (Hull 138) and Hangzhou (Hull 136), steam to designated sea area in East China Sea during a maritime realistic training exercise in early January, 2021.

The comprehensive supply ship Chaganhu executes alongside replenishment-at-sea with the amphibious transport dock landing ship Kunlunshan during a maritime training exercise in waters of the South China Sea on January 14, 2021.

A Y-20 large transport aircraft attached to an aviation division under the PLA Western Theater Command taxies on the runway during a flight training mission on January 4, 2021. (eng.chianmil.com.cn/Photo by Liu Shu)

Multi-type attack helicopters attached to a regiment of the PLA airborne troops lift off for their maiden flights this year on January 4, 2021.

Soldiers assigned to a brigade under the PLA 76th Group Army drive their armored vehicles en route to designated areas during a realistic training exercise on January 4, 2020.

Two J-10 fighter jets attached to an aviation brigade of the air force under the PLA Southern Theater Command take off in echelon formation for an aerial combat flight training exercise on December 30, 2020.

Soldiers assigned to an army aviation brigade under the PLA 72nd Group Army queue to board a Mi-171 transport helicopter during a realistic training exercise on January 4th, 2021.

Three guided-missile frigates attached to the frigate flotilla of a navy base under the PLA Southern Theater Command steam in formation during a training exercise in waters of the South China Sea on Jan. 4, 2021.

The armored detachment of a regiment under the PLA Xinjiang Military Command conducts field maneuver training in extremely cold weather on Jan. 4, 2021.