KABUL (AFP) - The Afghan and US militaries Monday played down a report that US-supplied weapons and ammunition were ending up in the hands of Taliban insurgents, saying the munitions were strictly controlled. The New York Times reported last week that ammunition recovered last month from the bodies of insurgents killed in eastern Afghanistan included rounds identical to those supplied by US forces to their Afghan counterparts. While it was unclear how often this happened, corruption in the Afghan forces and poor control of arms and ammunition sent to Afghanistan could be helping to supply the insurgents, the paper said. Asked about the allegation, Major General Richard Formica told reporters: We spend an inordinate amount of time accounting for the weapons and ammunition that is provided to us and we provide to the Afghans. The Afghan forces had also instituted a system of accountability that they were working hard to maintain, said Formica, who heads a US military unit that trains and supplies the Afghan forces. Afghan defence ministry spokesman, General Mohammad Zahir Azimi, told AFP separately that there was a strict system of checks and balances in place to monitor arms and ammunition. Taliban insurgents may be able to lay their hands on very, very small amounts of munitions taken from soldiers killed on the battlefield, he said. That is not an issue of concern, he said. Meanwhile, the outgoing top US commander in Afghanistan vowed success Monday in the fight against Taliban extremists in an emotional Memorial Day commemoration of soldiers killed in service. General David McKiernan led the event at Camp Eggers, the largest US base in the Afghan capital, which paid special tribute to a 25-year-old woman soldier and a 52-year-old US civilian killed in a bomb strike near Kabul last week. To those of us who deployed to this land, those who deployed with us that will not return home-we salute you and we will never forget you, McKiernan told a crowd of about 600 people that included Afghan cabinet ministers. Portraits were displayed of First Lieutenant Roslyn Schulte and contractor Shawn Pine, who were killed on May 20 when a remote-controlled bomb struck their vehicle as they were travelling to a US base at Bagram, north of Kabul. Referring to the September 11, 2001 attacks on the United States, McKiernan said: All of you are here today because our country was suddenly attacked and thousands of innocent Americans were killed by a shadowy terrorist network. In the course of that mission, we have also become committed to a better future for the people of Afghanistan, he said at the camp, the headquarters of a US military unit that trains and supplies the Afghan forces. It is a commitment we will not leave but we will see through to the very end, McKiernan said, adding: Make no mistake, we will be successful. Meanwhile, a bomb blamed on insurgents blew up a civilian minivan in southern Afghanistan Monday and killed four men while an Afghan soldier died elsewhere in a separate blast in the east, authorities said. Three more civilians were wounded in the explosion in the southern province of Zabul, deputy provincial police chief Ghulam Jailani Khan told AFP. The bomb had been planted to target security forces by the enemies of Afghanistan, Khan said, using a term referring to insurgents linked to the Taliban, who were in government until late 2001. Another bomb exploded near the eastern town of Khost on Monday, killing an Afghan soldier who was on patrol, an army official told AFP. Roadside bombs are the main Taliban weapon in a dragging insurgency that has led Afghanistans allies to deploy around 70,000 troops here to defeat extremists described as an international threat. The Afghan intelligence agency said three militants were also killed in the eastern province of Paktika on Monday when a bomb exploded as they were planting it into a road. And the defence ministry said troops killed three terrorists in southern Helmand province, an insurgent hotspot. A woman and a child were wounded in the operation on Sunday in the Nad Ali district, the US military said, confirming that three men were killed. Four others were arrested, it said. Helmand is a Taliban stronghold and the main producer of Afghanistans opium crop which is used to make heroin.