The military supply chain responsible for getting vital equipment to British forces on operations in Afghanistan and Libya is at "critical risk of failure", MPs have warned.
The Commons Public Accounts Committee said troops fighting on the front line could be hit by shortages within 30 days if the system broke down.
In a highly critical report, the committee said the Ministry of Defence (MoD) accepted the IT systems used to manage the complex supply chain were "not adequate for the task".
As a result, the risk of failure of these warehouse inventory systems was considered "extremely high" - and was recently rated as "critical" by the MoD's Defence Logistics Board. The report said: "If these systems fail, then the result could be shortages at the front line within as little as 30 days."
The committee said the MoD had spent £75 million upgrading the systems considered to be at the highest risk. However, an £800 million programme to overhaul the entire warehouse inventory management system - known as the Future Logistics Information Services project - will not be complete until 2014.
In the meantime, the committee expressed concern that funding for the programme could be affected by cuts to the defence budget. It said: "We are very concerned that, until the systems are fully rolled out in 2014, the high risk of system failure will remain in systems that are critical to supporting front line troops."
Committee chairwoman Margaret Hodge said: "For 25 years, the department has promised this committee that it would resolve the long-standing problems associated with its supply chain: late deliveries, missed targets and inadequate cost information. Yet these problems persist."
Defence equipment minister Peter Luff said the Government was investing £800 million in the supply chain to ensure it was "as efficient and cost effective as possible".
"Ensuring our armed forces on the frontline have all they need is a top priority and there are no shortages in Afghanistan," he said.
"The complexity of supplying a conflict zone should not be underestimated and we have successfully kept our troops supplied, overcoming major challenges like the Icelandic ash cloud and disruption to overland supply routes in Afghanistan."