The most senior US soldier, Adm Mike Mullen, has said the war in Libya is "moving towards stalemate", even though US and Nato air strikes have destroyed 30-40% of Libya's ground forces.
The US has authorised the use of armed, unmanned Predator drones over Libya to give "precision capabilities".
Libyan rebels have been battling Col Gaddafi's troops since February but have recently made little headway.
Adm Mullen also said there was no sign of al-Qaeda in the Libyan opposition.
In a speech to US troops in Iraq, he admitted radical groups might try to take advantage of the uprising in Libya, but added: "We're watchful of it, mindful of it and I just haven't seen much of it at all. In fact, I've seen no al-Qaeda representation there at all."
Last month, a Nato commander said US intelligence had picked up "flickers" of al-Qaeda activity among the rebels.
Urban targets
Meanwhile, a fourth evacuation ship chartered by the International Organisation for Migration is on its way to rescue stranded migrant workers and wounded civilians from the besieged city of Misrata.
The US hopes the low-flying pilotless drones will be able to accurately target pro-Gaddafi units on the ground in built-up areas like Misrata, where there is a high risk of civilian casualties.
Unmanned US drones are already used to target militants along the Pakistan-Afghanistan border.
US Defence Secretary Robert Gates has said two Predator drones were being made available for Nato use, but insisted there were still no plans to send in US ground troops.
The Pentagon said the first drone mission took place on Thursday but turned back because of bad weather.
Libya's deputy foreign minister warned that the drones would increase civilian casualties and would not change the outcome of the conflict.
"They [drones] will kill more civilians and this is very sad," Khaled Khaim told the BBC.
"It's for the Libyans to choose their destiny - not by sending more weapons or more air strikes, or more money and weapons to the rebels."
"I think what they are doing is undemocratic, illegitimate. I do hope that they will reverse their decision."
Meanwhile, US Senator John McCain has arrived on a visit to the rebel stronghold of Benghazi.
A crowd of about 50 people greeted him at the courthouse in Benghazi, chanting, "The nasty Gaddafi has left and McCain came", the AFP news agency reports.
Senator McCain, a former Republican presidential candidate, is the highest-ranking US official to visit the rebel-held east of the country since the uprising began two months ago.
Mr McCain said the rebels needed "a lot of help" and wanted the world to follow France and Italy in formally recognising them as Libya's leaders.
"I just came from the hospital where I saw a number of people who are badly wounded and dying," he said.
"That frankly puts a face on it that argues maybe we should be doing everything we can to help these people, and maybe we're not and they're dying."
Post captured
On Thursday, Libyan rebels were reported to have seized control of a border post on the Tunisian border in a rare advance in the west.
Restrictions on journalists in remote areas of Libya mean it is hard to independently verify such reports.
Street warfare is also continuing in the besieged city of Misrata, where the BBC's Orla Guerin in Misrata has seen evidence that cluster bombs are being used by pro-Gaddafi forces.
Doctors told our correspondent the bombs are causing increasingly horrific injuries, with some civilians losing limbs.
The Libyan government has so far denied the charge.
Government spokesman Moussa Ibrahim has warned the international community to stay out of Misrata, saying the government will "unleash hell" if foreign troops enter the city.
Copyright © 2011 BBC News.
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