By Phil Stewart, Idrees Ali, Doina Chiacu and Susan Heavey
WASHINGTON, March 2 (Reuters) - It will take time to achieve U.S. military objectives in Iran and additional U.S. casualties are expected, U.S. General Dan Caine, the chairman of the Joint Chiefs of Staff, said on Monday, as the United States and Israel's strikes on Iran continued for a third day.
The U.S.-Israeli air war against Iran expanded on Monday with no end in sight. The U.S. military said Kuwait's air defenses had mistakenly shot down three American F-15E fighter jets during an Iranian attack.
"This is not a single overnight operation. The military objectives that CENTCOM and the Joint Force have been tasked with will take some time to achieve, and in some cases will be difficult and gritty work," Caine told reporters. He added that the United States continued to send additional troops to the Middle East, even after a massive military buildup.
Caine's comments come a day after U.S. President Donald Trump suggested that strikes against Iran could go on for the next four weeks.
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A fourth U.S. service member on Monday died of injuries sustained in the U.S. operation against Iran. U.S. military forces have intercepted hundreds of ballistic missiles targeting U.S. and partners in the region.
During the same press conference, U.S. Defense Secretary Pete Hegseth said that military operations against Iran would not lead to an "endless war," though he acknowledged that the operation would not be complete overnight. Hegseth said the aim was to destroy Tehran's missiles, navy and other security infrastructure.
"This is not Iraq. This is not endless," Hegseth said.
In the biggest U.S. foreign policy gamble in decades, President Donald Trump launched the campaign alongside Israel on Saturday against a foe that had tormented the United States and its allies for generations.
Even with the U.S.-Israeli strikes, the conservative clerical leaders in Iran have shown no sign of yielding power. Military experts say U.S. and Israeli air power, with no armed force on the ground, may not be enough to drive them out. Meanwhile, scores of Iranians have been reported killed in strikes, including several that hit apparent civilian targets.
(Reporting by Phil Stewart, Idrees Ali, Doina Chiacu; editing by Susan Heavey, Michelle Nichols and Nick Zieminski)
