We are investigating the usage of ammunition in the war fought by Russia in Ukraine to guarantee that our supplies prepared for possible future conflicts are sufficient," said the president of the Joint Chiefs of Staff of the American Army, General Mark Milley, quoted by Reuter's agency on Tuesday. Earlier quoted by "Politico" U.S. Army Secretary Christine Wormuth said the United States increased the production of 155 mm artillery ammunition from 14,000 rounds a period to 20,000 in the spring of next year and 40,000 in 2025.