Gallup reports that "Americans' 60% approval for U.S. military action against Islamic militants in Iraq and Syria, commonly known as ISIS, is slightly below their average 68% approval for 10 other U.S. military operations Gallup has asked about using this question format. Americans have been a bit less supportive of recent military actions after prolonged engagements in Afghanistan and Iraq."
"The most recent results are based on a Sept. 20-21 Gallup poll, conducted after the U.S. had launched airstrikes in Iraq but before military action began in Syria on Sept. 22. President Barack Obama announced his intention in a nationally televised address on Sept. 10 to use U.S. military force to "degrade and destroy" ISIS, also known as ISIL, in those two countries."
"Notably, there is little partisan difference in opinions of the U.S. military action, with 64% of Democrats and 65% of Republicans approving. Independents are somewhat less likely to approve, but a majority (55%) still do."