A former U.S. Army captain who served in Afghanistan and has written a book about his experiences talked to Erin Burnett about the profound effects of extended combat, repeated tours of duty, and the stress of years of war. Sean Parnell, author of "Outlaw Platoon", says squads need to process stress together, as a team, just the way they have been trained to fight.
In a joint news conference with British prime minister David Cameron, President Obama spoke of a "shrinking window" of opportunity for Iran to negotiate a peaceful settlement over the country's nuclear program. Could that language signal a move toward tougher talk–and a move toward the use of force against Iran?
By Christopher Moloney, OutFront producer
Tuesday Rick Santorum won the primaries in Mississippi and Alabama which means there is still no clear frontrunner in the GOP race.
But it might not matter.
Because the date of the election may have already guaranteed a Republican candidate will win.