Just how tough is it going to be for the Pentagon and other national-security agencies to cut $400 billion from their spending between now and 2023? Those are the marching orders President Obama has given his tea, led by budget-cutting expert Leon Panetta, who has just moved from the CIA to the Pentagon. John Nagl of the Center for a New American Security and your Battlelander discuss the challenge with Dave Barno, retired Army lieutenant general, and Nora Bensahel, a military strategist formerly at the Rand Corp. and now at CNAS.