Paul McCormack talks about the events surrounding the attacks on Sept. 11, 2001, while viewing the installation of a photography exhibit titled "Ground Zero 360 - Never Forget" at the Field Museum Friday, August 26, 2011, in Chicago. McCormack's wife, Nicola McClean (not pictured) photographed the attacks' aftermath while McCormack oversaw rescue operations as an NYPD precinct captain. | John J. Kim~Sun-Times

A photography exhibit titled "Ground Zero 360 - Never Forget," by Nicola McClean, is displayed at the Field Museum Friday, August 26, 2011, in Chicago. McClean (not pictured) photographed the Sept. 11, 2001 attacks' aftermath while her husband, former NYPD Police Captain Paul McCormack, oversaw rescue operations at the time. | John J. Kim~Sun-Times

Paul McCormack, right, talks about the events surrounding the attacks on Sept. 11, 2001, while viewing the installation of a photography exhibit titled "Ground Zero 360 - Never Forget" at the Field Museum Friday, August 26, 2011, in Chicago. McCormack's wife, Nicola McClean (not pictured) photographed the attacks' aftermath while McCormack oversaw rescue operations as an NYPD precinct captain. In the foreground is a slab of steel from the World Trade Center. | John J. Kim~Sun-Times

A slab of granite from the World Trade Center is part of a photography exhibit titled "Ground Zero 360 - Never Forget," by Nicola McClean, which is displayed at the Field Museum Friday, August 26, 2011, in Chicago. McClean (not pictured) photographed the Sept. 11, 2001 attacks' aftermath while her husband, former NYPD Police Captain Paul McCormack, oversaw rescue operations at the time. | John J. Kim~Sun-Times

Paul McCormack talks about the events surrounding the attacks on Sept. 11, 2001, while viewing the installation of a photography exhibit titled "Ground Zero 360 - Never Forget" at the Field Museum Friday, August 26, 2011, in Chicago. McCormack's wife, Nicola McClean (not pictured) photographed the attacks' aftermath while McCormack oversaw rescue operations as an NYPD precinct captain. | John J. Kim~Sun-Times

Paul McCormack touches a slab of granite from the World Trade Center while talking about the events surrounding the attacks on Sept. 11, 2001, during the the installation of a photography exhibit titled "Ground Zero 360 - Never Forget" at the Field Museum Friday, August 26, 2011, in Chicago. McCormack's wife, Nicola McClean (not pictured) photographed the attacks' aftermath while McCormack oversaw rescue operations as an NYPD precinct captain. | John J. Kim~Sun-Times

Missing Person fliers are part of a photography exhibit titled "Ground Zero 360 - Never Forget," by Nicola McClean, which is displayed at the Field Museum Friday, August 26, 2011, in Chicago. McClean (not pictured) photographed the Sept. 11, 2001 attacks' aftermath while her husband, former NYPD Police Captain Paul McCormack, oversaw rescue operations at the time. | John J. Kim~Sun-Times

Paul McCormack talks about the events surrounding the attacks on Sept. 11, 2001, while viewing the installation of a photography exhibit titled "Ground Zero 360 - Never Forget" at the Field Museum Friday, August 26, 2011, in Chicago. McCormack's wife, Nicola McClean (not pictured) photographed the attacks' aftermath while McCormack oversaw rescue operations as an NYPD precinct captain. | John J. Kim~Sun-Times

Copies of missing person fliers are part of a photography exhibit titled "Ground Zero 360 - Never Forget," by Nicola McClean, which is displayed at the Field Museum Friday, August 26, 2011, in Chicago. McClean (not pictured) photographed the Sept. 11, 2001 attacks' aftermath while her husband, former NYPD Police Captain Paul McCormack, oversaw rescue operations at the time. | John J. Kim~Sun-Times

Paul McCormack talks about the events surrounding the attacks on Sept. 11, 2001, while viewing the installation of a photography exhibit titled "Ground Zero 360 - Never Forget" at the Field Museum Friday, August 26, 2011, in Chicago. McCormack's wife, Nicola McClean (not pictured) photographed the attacks' aftermath while McCormack oversaw rescue operations as an NYPD precinct captain. | John J. Kim~Sun-Times

A photography exhibit titled "Ground Zero 360 - Never Forget," by Nicola McClean, is displayed at the Field Museum Friday, August 26, 2011, in Chicago. McClean (not pictured) photographed the Sept. 11, 2001 attacks' aftermath while her husband, former NYPD Police Captain Paul McCormack, oversaw rescue operations at the time. | John J. Kim~Sun-Times