The cost of construction equipment for the Gulf war is in excess $50 million, according to a new report.
The US and Gulf countries are building more than a dozen airbases, including one in Qatar, which has been a US ally since the US invasion of Iraq.
The report by the International Crisis Group said that US and British military personnel have already spent $6.5bn on construction and logistical equipment, including aircraft, helicopters and submarines.
The US has spent about $2bn to build its new base in Qatar in preparation for the conflict with Iran.
Qatar was part of a coalition which helped the US in its invasion of the country.
A UK spokesman said: “This report does not reflect the full picture, as we do not yet have complete information about how the war effort will be affected by the war.
We are working with the Government of Qatar and all relevant partners in the region to ensure that this information is shared.”
Qatar has long been a key US ally in the Gulf, and many of its facilities are located on its territory.
Qatar is also one of the only countries in the Middle East that is considered a safe haven for US troops in times of war.
The Gulf war began on 6 August 2003, when the US-led coalition launched an invasion to oust Saddam Hussein’s regime in Iraq.
The invasion has cost over 4,400 lives and displaced more than half a million Iraqis, according in the UN.