Terry Gross

The Air Force's Bay State Winds Clarinet Quartet joins Terry Gross for a discussion of military ensembles. The group also performs several songs in tribute to the men and women who've served since Sept. 11, 2001.

NBC News chief foreign correspondent Richard Engel details what it's like to report from some of the more dangerous war zones on the planet. He also discusses his recent dispatches from Egypt and Libya, where he was subject to tear gas attacks and artillery fire.

Washington Post national security reporter Dana Priest's book Top Secret America looks at the top-secret intelligence and counterterrorism network created after Sept. 11. "No one knows how much money it costs, how many people it employs, [or] how many programs exist within it," she says.