The top U.S. military officer acknowledged on Sunday that a no-fly zone over Libya could end in a stalemate with Muammar Gaddafi's forces even as Western warplanes halted an anti-rebel offensive at Benghazi.
Admiral Mike Mullen, chairman of the U.S. military's Joint Chiefs of Staff, told the CBS program "Face the Nation" that the air mission in the North African country has a clear, limited scope.
But Mullen said the end-game of military action in Libya was "very uncertain." Asked if it could end in a stalemate with Gaddafi, Mullen replied: "I don't think that's for me to answer. Certainly, I recognize that's a possibility."
"It's very uncertain on how this ends," he added.
The aerial assault by U.S., French and British planes stopped an advance by Gaddafi's troops on the rebel-held city of Benghazi and killed at least 14 government soldiers.
The United States says the U.N.-endorsed intervention is aimed at forcing Gaddafi's troops into a cease-fire and end attacks on civilians who launched an uprising last month.
Forces loyal to Gaddafi, who has ruled Libya for 41 years, have taken back large swathes of territory from rebels but the air attacks may help the rebels regroup.
Mullen told NBC's "Meet the Press" program that the U.S.-led air strikes "took out" Gaddafi's air defenses, struck air fields and attacked Libyan ground forces near the eastern rebel stronghold of Benghazi.
"He (Gaddafi) hasn't had aircraft or helicopters flying the last couple days. So effectively that no-fly zone has been put in place," Mullen said.
"We have halted him in the vicinity of Benghazi, which is where he was most recently on the march," he said, adding that Western forces had established combat air patrols over the city that would be extended westward toward Tripoli over time.
Mullen said Western military operations are narrowly focused on protecting civilians and aiding humanitarian efforts.
U.S. officials are eager to avoid comparisons between the attacks on Gaddafi's forces and the 2003 U.S.-led invasion of Iraq that ended President Saddam Hussein's long grip on power.
CALL FOR GADDAFI OUSTER
But Senator Joe Lieberman, a leading U.S. proponent of the no-fly zone, called for Gaddafi to be removed from office.
"Once the president of the United States says, as President (Barack) Obama did, that Gaddafi must go, if we don't work with our allies to make sure Gaddafi does go, America's credibility and prestige suffers all over the world," Lieberman told CNN.
Senator Lindsey Graham told the "Fox News Sunday" program the mission should be to get rid of Gaddafi, saying it should "isolate, strangle and replace this man."
Mullen, asked whether the Libya operation could end with Gaddafi still in power, told CNN's "State of the Union" program: "I wouldn't speculate how this exactly would come out, and who would be where when."
France sent an aircraft carrier toward Libya and its planes were over the country again on Sunday, defense officials said. Britain said its planes had targeted Libya's air defenses mainly around the capital Tripoli.
Italian aircraft are ready to join operations against Libya from Sunday, Defense Minister Ignazio La Russa said.
In the next few days, Mullen said, the United States expects to relinquish its leadership of the operation, dubbed "Odyssey Dawn." But he did not say who would assume the lead.
The U.S. role would then shift to support operations including intelligence, signal jamming, aerial refueling and humanitarian efforts.
Carl Levin, chairman of the U.S. Senate Armed Services Committee, told NBC's "Meet the Press" that the military mission has been "very carefully limited."
"After a few days there will be a handoff after the air is cleared of any threats. There will be a handoff to our allies and this mission will then be carried out by the French, by British and Arab countries," Levin said.
U.S. Navy Growlers provided electronic support while AV-8B Harriers from the 26th Marine Expeditionary Unit conducted air strikes against Gaddafi's ground forces and air defenses.
Missile strikes launched by the United States and Britain as part of a bid to cripple Libyan air defenses hit 20 of 22 targets, the U.S. military said. The military also said three U.S. stealth bombers took part in airstrikes early on Sunday.
Mullen said Gaddafi has sought to protect targets with human shields. But he added that he had seen no reports of civilian casualties from the air strikes, which Mullen said were calculated to minimize "collateral damage."
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