In the first public accounting of its kind in decades, an Associated Press investigation has found that at least 1,900 U.S. military firearms were lost or stolen during the 2010s, with some resurfacing in violent crimes.

At Fort Campbell, from 2013 to 2016, soldiers stole machine gun parts and other items that ended up with online buyers in Russia, China, Mexico and elsewhere. The civilian ringleader from Clarksville, who was found with a warehouse of items, was convicted. Authorities said he made hundreds of thousands of dollars.

Weapons disappearances have happened across the armed forces.

Government records covering the Army, Marine Corps, Navy and Air Force show pistols, machine guns, shotguns and automatic assault rifles have vanished from armories, supply warehouses, Navy warships, firing ranges and other places where they were used, stored or transported. These weapons of war disappeared because of unlocked doors, sleeping troops, a surveillance system that didn’t record, break-ins and other security lapses that, until now, have not been publicly reported.

While AP’s focus was firearms, military explosives also were lost or stolen, including armor-piercing grenades that ended up in an Atlanta backyard.

Weapon theft or loss spanned the military’s global footprint, touching installations from coast to coast, as well as overseas. In Afghanistan, someone cut the padlock on an Army container and stole 65 Beretta M9s. The theft went undetected for at least two weeks, when empty pistol boxes were discovered in the compound. The weapons were not recovered.

READ THE FULL AP REPORTS:

On Tuesday, in the wake of the AP investigation, Army Secretary Christine Wormuth told a hearing of the Senate Armed Services Committee that she would be open to new oversight on weapons accountability. The Pentagon used to share annual updates about stolen weapons with Congress, but the requirement to do so ended years ago and public accountability has slipped.