Book excerpt: "The Fifth Act," on one American's role in Afghanistan

In "The Fifth Act: America's End in Afghanistan" (published by Penguin Press on August 9), Elliot Ackerman, who served four combat tours in Afghanistan with the Marines and the CIA, writes of how his mission continued, in seeking to rescue an Afghan and his family from the country's fall to the Taliban.

Read the excerpt below, and don't miss David Martin's interview with Elliot Ackerman on "CBS Sunday Morning" August 7!