WASHINGTON - Republican Jeb Bush staked out a robust vision for US foreign policy in line with party doctrine on Wednesday and sought to ease concerns that he might be influenced by his powerful political family by insisting, "I'm my own man."A frontrunner for the Republican presidential nomination in 2016, Bush said he would back a global strategy against Islamic State that "takes them out."But he offered no specifics on how to do this and avoided military threats that could reawaken memories of the 2003 US-led invasion of Iraq launched by his older brother, former President George W. Bush, over weapons of mass destruction that were never found.Speaking at the Chicago Council on Global Affairs, the former Florida governor struck a balance between respecting the service of his father, former President George H.W. Bush, and brother, while suggesting he would make decisions based on circumstances neither of them had to face."I'm my own man, and my views are shaped by my own thinking and my own experiences," Bush said.