Service members of the self-proclaimed Donetsk People's Republic (DNR) sit next to a howitzer during military exercises at a target range outside Donetsk, Ukraine August 25, 2020. REUTERS/Alexander Ermochenko

Service members of the self-proclaimed Donetsk People's Republic (DNR) fire a howitzer during military exercises at a target range outside Donetsk, Ukraine August 25, 2020. REUTERS/Alexander Ermochenko

U.S. Military Academy (USMA) cadets wear protective face masks as they fire an M119 105 mm Howitzer artillery weapon during tactical and physical training activities as part of Cadet Summer Training at West Point, New York, U.S., August 7, 2020. REUTERS/Mike Segar

A U.S. Military Academy (USMA) cadet wears a protective face mask while waiting to load a live 105 mm shell into an M119 105 mm Howitzer artillery weapon during tactical and physical training activities as part of Cadet Summer Training at West Point, New York, U.S., August 7, 2020. REUTERS/Mike Segar

U.S. Military Academy (USMA) cadets wear protective face masks while they wait to load live 105 mm shells into an M119 105 mm Howitzer artillery weapon during tactical and physical training activities as part of Cadet Summer Training at West Point, New York, U.S., August 7, 2020. REUTERS/Mike Segar

U.S. Military Academy (USMA) cadets wear protective face masks as they fire an M119 105 mm Howitzer artillery weapon during tactical and physical training activities as part of Cadet Summer Training at West Point, New York, U.S., August 7, 2020. REUTERS/Mike Segar

U.S. Military Academy (USMA) cadets wear protective face masks as they fire an M119 105 mm Howitzer artillery weapon during tactical and physical training activities as part of Cadet Summer Training at West Point, New York, U.S., August 7, 2020. REUTERS/Mike Segar

Soldiers fire a 8 inch (203 mm) M110 self-propelled howitzer during the live-fire, anti-landing Han Kuang military exercise, which simulates an enemy invasion, in Taichung, Taiwan July 16, 2020. REUTERS/Ann Wang

Soldiers fire M109A2 155mm howitzers during the live-fire, anti-landing Han Kuang military exercise, which simulates an enemy invasion, in Taichung, Taiwan July 16, 2020. REUTERS/Ann Wang

Russian MSTA-SM self-propelled howitzers drive during the Victory Day Parade in Red Square in Moscow, Russia, June 24, 2020. The military parade, marking the 75th anniversary of the victory over Nazi Germany in World War Two, was scheduled for May 9 but postponed due to the outbreak of the coronavirus disease (COVID-19). Pavel Golovkin/Pool via REUTERS

Russian MSTA-SM self-propelled howitzers drive during the Victory Day Parade in Red Square in Moscow, Russia June 24, 2020. The military parade, marking the 75th anniversary of the victory over Nazi Germany in World War Two, was scheduled for May 9 but postponed due to the outbreak of the coronavirus disease (COVID-19). REUTERS/Maxim Shemetov

A Russian MSTA-SM self-propelled howitzer drives during the Victory Day Parade in Moscow, Russia, June 24, 2020. The military parade, marking the 75th anniversary of the victory over Nazi Germany in World War Two, was scheduled for May 9 but postponed due to the outbreak of the coronavirus disease (COVID-19). Host photo agency via REUTERS

Russian Koalitsiya-SV self-propelled howitzers drive during the Victory Day Parade in Red Square in Moscow, Russia, June 24, 2020. The military parade, marking the 75th anniversary of the victory over Nazi Germany in World War Two, was scheduled for May 9 but postponed due to the outbreak of the coronavirus disease (COVID-19). Host photo agency/Iliya Pitalev via REUTERS

Russian MSTA-SM self-propelled howitzers drive during the Victory Day Parade in Red Square in Moscow, Russia, June 24, 2020. The military parade, marking the 75th anniversary of the victory over Nazi Germany in World War Two, was scheduled for May 9 but postponed due to the outbreak of the coronavirus disease (COVID-19). Host photo agency/Vladimir Pesnya via REUTERS

Russian Koalitsiya-SV self-propelled howitzers drive during the Victory Day Parade in Red Square in Moscow, Russia, June 24, 2020. The military parade, marking the 75th anniversary of the victory over Nazi Germany in World War Two, was scheduled for May 9 but postponed due to the outbreak of the coronavirus disease (COVID-19). Host photo agency/Mikhail Voskresensliy via REUTERS

The toppled Richmond Howitzers Monument, erected in 1892 to commemorate a Confederate artillery unit, lies on the ground after protesters against racial inequality pulled it down overnight in Richmond, Virginia, U.S. June 17, 2020. REUTERS/Jay Paul

People watch workmen get ready to load the toppled Richmond Howitzers Monument, erected in 1892 to commemorate a Confederate artillery unit, onto a truck after protesters against racial inequality pulled it down overnight in Richmond, Virginia, U.S. June 17, 2020. REUTERS/Jay Paul

The toppled Richmond Howitzers Monument, erected in 1892 to commemorate a Confederate artillery unit, lies on the ground after protesters against racial inequality pulled it down overnight in Richmond, Virginia, U.S. June 17, 2020. REUTERS/Jay Paul

The toppled Richmond Howitzers Monument, erected in 1892 to commemorate a Confederate artillery unit, lies on the ground after protesters against racial inequality pulled it down overnight in Richmond, Virginia, U.S. June 17, 2020. REUTERS/Jay Paul

Workmen load and covering the toppled Richmond Howitzers Monument, erected in 1892 to commemorate a Confederate artillery unit, onto a truck after protesters against racial inequality pulled it down overnight in Richmond, Virginia, U.S. June 17, 2020. REUTERS/Jay Paul

Workmen get ready to load the toppled Richmond Howitzers Monument, erected in 1892 to commemorate a Confederate artillery unit, onto a truck after protesters against racial inequality pulled it down overnight in Richmond, Virginia, U.S. June 17, 2020. REUTERS/Jay Paul

Workmen load the toppled Richmond Howitzers Monument, erected in 1892 to commemorate a Confederate artillery unit, onto a truck after protesters against racial inequality pulled it down overnight in Richmond, Virginia, U.S. June 17, 2020. REUTERS/Jay Paul

Workman loads the toppled Richmond Howitzers Monument, erected in 1892 to commemorate a Confederate artillery unit, onto a truck after protesters against racial inequality pulled it down overnight in Richmond, Virginia, U.S. June 17, 2020. REUTERS/Jay Paul

Workmen get ready to load the toppled statue from the Richmond Howitzers Monument, erected in 1892 to commemorate a Confederate artillery unit, onto a truck after being protesters against racial inequality pulled it down overnight in Richmond, Virginia, U.S. June 17, 2020. REUTERS/Jay Paul

Workmen get ready to load the toppled statue from the Richmond Howitzers Monument, erected in 1892 to commemorate a Confederate artillery unit, onto a truck after being protesters against racial inequality pulled it down overnight in Richmond, Virginia, U.S. June 17, 2020. REUTERS/Jay Paul

A statue from the Richmond Howitzers Monument, erected in 1892 to commemorate a Confederate artillery unit, lies after being toppled by protesters against racial inequality overnight in Richmond, Virginia, U.S. June 17, 2020. REUTERS/Jay Paul TPX IMAGES OF THE DAY

A serviceman of the self-proclaimed Donetsk People's Republic (DNR) fires a howitzer during a military exercise at a target range outside the town of Horlivka (Gorlivka), Ukraine May 21, 2020. REUTERS/Alexander Ermochenko

Servicemen of the self-proclaimed Donetsk People's Republic (DNR) fire howitzers during military exercises at a target range outside the town of Horlivka (Gorlivka), Ukraine May 21, 2020. REUTERS/Alexander Ermochenko

Russian servicemen drive self-propelled howitzers along the street during a rehearsal for the Victory Day parade, amid the coronavirus disease (COVID-19) outbreak, in Yekaterinburg, Russia April 14, 2020. REUTERS/Alexei Kolchin

U.S. Army soldiers from the 2nd Platoon, B battery 2-8 field artillery, fire a howitzer artillery piece at Seprwan Ghar forward fire base in Panjwai district, Kandahar province southern Afghanistan, June 12, 2011. Picture taken June 12, 2011. REUTERS/Baz Ratner/File Photo SEARCH "POY DECADE" FOR THIS STORY. SEARCH "REUTERS POY" FOR ALL BEST OF 2019 PACKAGES. TPX IMAGES OF THE DAY.

A Turkish army howitzer is positioned near the Turkish-Syrian border in Sanliurfa province, Turkey, October 17, 2019. REUTERS/Murad Sezer

Japanese Ground Self-Defense Force's Type19 155 mm self-propelled howitzer takes part in an annual training session near Mount Fuji at Higashifuji training field in Gotemba, west of Tokyo, Japan August 22, 2019. REUTERS/Issei Kato

Japanese Ground Self-Defense Force fires FH70 155mm howitzer during an annual training session near Mount Fuji at Higashifuji training field in Gotemba, west of Tokyo, Japan August 22, 2019. REUTERS/Issei Kato

Japanese Ground Self-Defense Force soldiers onboard a Type19 155 mm self-propelled howitzer take part in an annual training session near Mount Fuji at Higashifuji training field in Gotemba, west of Tokyo, Japan August 22, 2019. REUTERS/Issei Kato

Japanese Ground Self-Defense Force's Type19 155 mm self-propelled howitzer takes part in an annual training session near Mount Fuji at Higashifuji training field in Gotemba, west of Tokyo, Japan August 22, 2019. REUTERS/Issei Kato

MSTA-S self-propelled artillery howitzers drive during a demonstration at the International military-technical forum ARMY-2019 at Patriot Congress and Exhibition Centre in Moscow Region, Russia June 25, 2019. REUTERS/Maxim Shemetov

Soldiers fire a 8 inch (203 mm) M110 self-propelled howitzer during the live fire Han Kuang military exercise, which simulates China's People's Liberation Army (PLA) invading the island, in Pingtung, Taiwan May 30, 2019. REUTERS/Tyrone Siu

Soldiers fire a 8 inch (203 mm) M110 self-propelled howitzer during the live fire Han Kuang military exercise, which simulates China's People's Liberation Army (PLA) invading the island, in Pingtung, Taiwan May 30, 2019. REUTERS/Tyrone Siu

Soldiers reload a 8 inch (203 mm) M110 self-propelled howitzer during the live fire Han Kuang military exercise, which simulates China's People's Liberation Army (PLA) invading the island, in Pingtung, Taiwan May 30, 2019. REUTERS/Tyrone Siu

Russian servicemen drive MSTA-S self-propelled howitzers during the Victory Day parade, which marks the anniversary of the victory over Nazi Germany in World War Two, in Dvortsovaya Square in St. Petersburg, Russia May 9, 2019. REUTERS/Anton Vaganov

Russian servicemen drive MSTA-S self-propelled howitzers during the Victory Day parade, which marks the anniversary of the victory over Nazi Germany in World War Two, in Red Square in central Moscow, Russia May 9, 2019. REUTERS/Shamil Zhumatov

Russian servicemen drive MSTA-S self-propelled howitzers during the Victory Day parade, which marks the anniversary of the victory over Nazi Germany in World War Two, in Red Square in central Moscow, Russia May 9, 2019. REUTERS/Maxim Shemetov

Russian servicemen drive MSTA-S self-propelled howitzers during the Victory Day parade, which marks the anniversary of the victory over Nazi Germany in World War Two, in Red Square in central Moscow, Russia May 9, 2019. REUTERS/Shamil Zhumatov

MSTA-S self-propelled howitzers drive during a rehearsal for the Victory Day parade, which marks the anniversary of the victory over Nazi Germany in World War Two, in Red Square in central Moscow, Russia May 7, 2019. REUTERS/Maxim Shemetov

MSTA-S self-propelled howitzers drive during a rehearsal for the Victory Day parade, which marks the anniversary of the victory over Nazi Germany in World War Two, in Red Square in central Moscow, Russia May 7, 2019. REUTERS/Maxim Shemetov

People make a selfie in front of Russia's army MSTA-S self-propelled howitzers in Tverskaya Street before the rehearsal for the Victory Day parade in Moscow, Russia May 4, 2019. REUTERS/Evgenia Novozhenina

A Russia's army serviceman cleans MSTA-S self-propelled howitzer in Tverskaya Street before the rehearsal for the Victory Day parade in Moscow, Russia May 4, 2019. REUTERS/Evgenia Novozhenina

Pedestrians cross a road nest to a self-propelled howitzer during a rehearsals for the Victory Day military parade in Saint Petersburg, Russia April 30, 2019. REUTERS/Anton Vaganov TPX IMAGES OF THE DAY

Pedestrians cross a road nest to a self-propelled howitzer during a rehearsals for the Victory Day military parade in Saint Petersburg, Russia April 30, 2019. REUTERS/Anton Vaganov

A Russian-made MSTA-S self-propelled howitzer drives along a road, with the Moscow International Business Centre, also known as "Moskva-City", seen in the background, before a rehearsal for the Victory Day parade, which marks the anniversary of the victory over Nazi Germany in World War Two, in Moscow, Russia April 29, 2019. REUTERS/Evgenia Novozhenina

M110A2 and M109A2 self-propelled howitzers fire during an anti-invasion drill to test their readiness ahead of Lunar New Year, simulating enemy invasion and the safeguarding of the weapon systems in case of air raid, in Taichung, Taiwan January 17, 2019. REUTERS/Tyrone Siu

A Ukrainian soldier fires with a howitzer during military exercises in the Ukrainian Ground Forces training centre near Honcharivske in Chernihiv region, Ukraine December 3, 2018. REUTERS/Valentyn Ogirenko TPX IMAGES OF THE DAY

A Ukrainian soldier fires with a howitzer during military exercises in the Ukrainian Ground Forces training centre near Honcharivske in Chernihiv region, Ukraine December 3, 2018. REUTERS/Valentyn Ogirenko

Servicemen of the self-proclaimed Lugansk People's Republic (LNR) fire D-30 howitzers during military exercises at a target range in Luhansk Region, Ukraine September 24, 2018. REUTERS/Alexander Ermochenko

Latvian soldiers with their M109 155mm self-propelled howitzer and Polish soldiers with their PT-91 tank take part in the military exercise Namejs 2018 in Adazi, Latvia September 1, 2018. REUTERS/Ints Kalnins

Self-propelled howitzers pass during a military parade marking Ukraine's Independence Day in Kiev, Ukraine August 24, 2018. REUTERS/Gleb Garanich

Russian servicemen sit atop a 2S5 Giatsint-S self-propelled howitzer during the annual international military-technical forum "ARMY" in Alabino, outside Moscow, Russia August 23, 2018. REUTERS/Maxim Shemetov

Russian MSTA-S self-propelled howitzers fire during a demonstration at the annual international military-technical forum "ARMY" in Alabino, outside Moscow, Russia August 23, 2018. REUTERS/Maxim Shemetov

A Russian MSTA-S self-propelled howitzer fires during a demonstration at the annual international military-technical forum "ARMY" in Alabino, outside Moscow, Russia August 23, 2018. REUTERS/Maxim Shemetov

Japanese Ground Self-Defense Force fires a howitzer during an annual training session near Mount Fuji at Higashifuji training field in Gotemba, west of Tokyo, Japan August 23, 2018. REUTERS/Kim Kyung-Hoon