In the wake of White House counterterrorism advisor John Brennan’s speech on drone ethics and targeted killing, we talk to Yale Law School professor Stephen Carter, author of The Violence of Peace: America’s Wars in the Age of Obama.

"The administration says that the drone is the smallest amount of force that we could use. They say it's accurate and therefore it discriminates perfectly," observes Yale Law School professor Stephen Carter.

In this territorial dispute between India and Pakistan in what may be the world’s most militarized region, there are direct links between water availability, rising terrorism, and religious extremism among Hindus and Muslims.

Watch more of Kim Lawton’s interview with siblings who describe how their family survived World War II in a Jewish ghetto in Japanese-occupied Shanghai.

“We don’t treat soldiers that are atheists as atheists. We treat them as soldiers,” says Colonel Stephen Sicinski, base commander at Fort Bragg. But Captain Jason Torpy says army chaplains are "either ignorant of or hostile to nontheistic beliefs."

"People across the political spectrum, right to left, are beginning to wonder if we are committed to a mission whose success is dubious now at best because of the way we’ve defined it," says William Galston, a senior fellow at the Brookings Institution.

Does the US have a duty to act in Syria? Is it possible to somehow intervene and still do more good than harm? "Nothing is certain in human affairs," says this political and moral philosopher.

"For weeks the newspapers have included articles about the mounting deaths and suffering of ordinary Syrians. These articles implicitly pronounce a familiar imperative: something must be done. But in the face of this imperative, we are compelled by another: force is justified only where there is reasonable hope of doing more good than harm."

“When we’re using missiles that kill but place no risk,” suggests Yale law professor Stephen Carter, “that means it’s easier to fight, which means it’s more likely we’ll fight.”

After 10 years of war, says Georgetown University professor Nancy Sherman, US troops are coming home from Iraq, “and now they see that whole project of stability and democratization unraveling. They come home carrying heavy, invisible wounds, of a sense of betrayal and PTSD. Was it worth it?”