One of the reports also stated that explosives on a sunken World War Two munitions ship in the estuary, the SS Richard Montgomery, would need to be removed or treated before the airport could be constructed.
Karns said the bombers would enable US forces to drop one or two munitions in an area, rather than use carpet bombing.
According to the watchdog group Airwars, the coalition deployed some twenty thousand munitions during the Raqqa offensive and killed more than thirteen hundred civilians, including at least two hundred and fifty children.
During the past three months, the international coalition, fielding a nine-country armada that includes Australian F-18s, British Typhoons, Italian C-27Js, and American F-16s, Raptors, and B-52s, has launched more than ten thousand munitions.
Wilson told the tech blog Betabeat: "We got an official letter from the Secretary of State, telling me who they were, what their authority was under US law and telling me they want to review these files to see if they're class one munitions.
Experts estimate that only about six munitions a day can be safely removed.
The United Nations and human rights groups have said Israel dropped about 4 million cluster munitions during the 2006 war with Hezbollah.
In Hamdaniya, the SWAT team had seized more than two hundred homemade munitions, along with American anti-tank rockets known, during the Korean War, as super-bazookas.
In Captain Trad's case, he showed The New York Times his Syrian officer's identification card and accurately answered an extensive set of questions about Mi-17 munitions.
Taken together, Syria's helicopters have been used in attacks with high-explosive rockets fired from pods, in the release of unguided bombs like the OFAB and possibly in at least one cluster-munitions strike.
