Vice Adm. Bill Gortney told reporters at the Pentagon Thursday that the U.S. is working to ensure handover of leadership to NATO by the weekend.
Gortney said the US will continue to fly missions after that. He said attacks have been limited to outside the cities and "we're not attacking forces inside the cities."
"We're doing that because we're worried we could not meet our collateral damage estimates," he said. "We're putting pressure on Gadhafi's forces that are outside the city. ... If you can work on their supply lines and their logistics capability, they are not going to be able to maintain their efforts inside the city."
However, Libyan leader Moammar Gadhafi's forces have moved into cities making it difficult for the coalition to strike.
Coalition members participating in the operation Belgium, Canada, Denmark, Spain, France, Great Britain, Italy, Norway, Qatar and the U.S.
According to slides provided by the Pentagon, the US is at 449 sorties compared to 310 for all other nations combined.