The U.S. Army failed to properly monitor more than $1 billion worth of arms transfers in Iraq and Kuwait, according to a declassified government audit obtained by Amnesty International. Amnesty obtained the documents through Freedom of Information law requests. The groups research documents lax controls and record-keeping ... which has resulted in arms manufactured in the U.S. and other countries winding up in the hands of armed groups known to be committing war crimes and other atrocities, such as the Islamic State militant group (ISIS). The U.S. Department of Defense audit from September 2016 shows that the DoD did not have accurate, up-to-date records on the quantity and location of ... tens of thousands of assault rifles (worth $28 million), hundreds of mortar rounds and hundreds of Humvee armored vehicles destined for use by the central Iraqi Army. A previous DoD audit, in 2015, pointed to even less rigorous stockpile monitoring procedures being enforced by the Iraqi armed forces. Meanwhile, the Pentagon has overbilled the U.S. military for fuel by almost $6 billion over the past seven years, and then used the money to bolster underfunded or mismanaged defense programs, according to a report in The Washington Post on Saturday. Earlier, the federal Government Accountability Office criticized the U.S. for failing to account for thousands of rifles issued to Afghan security forces. The 2009 report said some weapons were documented to be in the hands of insurgents.