Members of the Columbia Accident Investigation Board examine pieces of Columbia debris in the RLV Hangar. The debris was shipped from the collection point at Barksdale Air Force Base, Shreveport, La. As part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven, workers will attempt to reconstruct the orbiter inside the RLV.

Members of the Columbia Accident Investigation Board examine pieces of Columbia debris in the RLV Hangar. The debris was shipped from the collection point at Barksdale Air Force Base, Shreveport, La. As part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven, workers will attempt to reconstruct the orbiter inside the RLV.

Richard Alonzo, in the Mail Room at KSC, prepares stacks of the Columbia Accident Investigation Report, which are being distributed to all employees. The delivery is a prelude to NASA Safety and Mission Success Week Nov. 17-21, during which all employees are being encouraged to consider ways they can support and enhance recommendations for improvement stated in the report.

Bill White, in the Mail Room at KSC, stacks copies of the Columbia Accident Investigation Report, which are being distributed to all employees. The delivery is a prelude to NASA Safety and Mission Success Week Nov. 17-21, during which all employees are being encouraged to consider ways they can support and enhance recommendations for improvement stated in the report.

KENNEDY SPACE CENTER, FLA. - During a media tour of the Columbia Debris Hangar, photographers focus on a piece of the debris collected from search and recovery efforts in East Texas. About 83,000 pieces of debris from Columbia were shipped to KSC, which represents about 38 percent of the dry weight of Columbia, equaling almost 85,000 pounds. The debris is being packaged for storage in an area of the Vehicle Assembly Building.

KENNEDY SPACE CENTER, FLA. - During a media tour of the Columbia Debris Hangar, a photographer examines some of the debris collected from search and recovery efforts in East Texas. About 83,000 pieces of debris from Columbia were shipped to KSC, which represents about 38 percent of the dry weight of Columbia, equaling almost 85,000 pounds. The debris is being packaged for storage in an area of the Vehicle Assembly Building.

KENNEDY SPACE CENTER, FLA. - During a media tour of the Columbia Debris Hangar, a video cameraman records some of the debris collected from search and recovery efforts in East Texas. About 83,000 pieces of debris from Columbia were shipped to KSC, which represents about 38 percent of the dry weight of Columbia, equaling almost 85,000 pounds. The debris is being packaged for storage in an area of the Vehicle Assembly Building.

KENNEDY SPACE CENTER, FLA. - During a media tour of the Columbia Debris Hangar, a photographer gets a close-up of the mockup of the leading edge of Columbia’s left wing. About 83,000 pieces of debris were shipped to KSC from search and recovery efforts in East Texas. About 83,000 pieces of debris from Columbia were shipped to KSC, which represents about 38 percent of the dry weight of Columbia, equaling almost 85,000 pounds. The debris is being packaged for storage in an area of the Vehicle Assembly Building.

KENNEDY SPACE CENTER, FLA. - During a media tour of the Columbia Debris Hangar, photographers pause at the mockup of the leading edge of Columbia’s left wing. About 83,000 pieces of debris from Columbia were shipped to KSC from search and recovery efforts in East Texas. About 83,000 pieces of debris were shipped to KSC, which represents about 38 percent of the dry weight of Columbia, equaling almost 85,000 pounds. The debris is being packaged for storage in an area of the Vehicle Assembly Building.

KENNEDY SPACE CENTER, FLA. - During a media tour of the Columbia Debris Hangar, photographers focus on part of the cockpit collected from search and recovery efforts in East Texas. About 83,000 pieces of debris from Columbia were shipped to KSC, which represents about 38 percent of the dry weight of Columbia, equaling almost 85,000 pounds. The debris is being packaged for storage in an area of the Vehicle Assembly Building.

KENNEDY SPACE CENTER, FLA. - During a media tour of the Columbia Debris Hangar, photographers look at pieces of tile collected during search and recovery efforts in East Texas. About 83,000 pieces of debris from Columbia were shipped to KSC, which represents about 38 percent of the dry weight of Columbia, equaling almost 85,000 pounds. The debris is being packaged for storage in an area of the Vehicle Assembly Building.

KENNEDY SPACE CENTER, FLA. - The mission patch for STS-107 is displayed, left, on the outside of the RLV Hangar at KSC. The hangar is the site of the Columbia Reconstruction Project, where pieces of debris from Columbia are being collected and identified as part of the mishap investigation.

KENNEDY SPACE CENTER, FLA. - Sen. Bill Nelson talks to the media at the NASA KSC News Center about the Columbia Accident Investigation Board report released today.

KENNEDY SPACE CENTER, FLA. - Sen. Bill Nelson talks to the media at the NASA KSC News Center about the Columbia Accident Investigation Board report released today.

NASA’s Mars Exploration Rover Spirit acquired this mosaic on May 21, 2007, while investigating the area east of the elevated plateau known as Home Plate in the Columbia Hills. 3D glasses are necessary to view this image.

KENNEDY SPACE CENTER, FLA. - Adm. Harold Gehman, far left, chairman of the Columbia Investigation Accident Board, looks at pieces of Columbia debris collected in the KSC RLV Hangar. Other members of the board accompanied him as part of the ongoing investigation. Recovery efforts as of May 5 included 82,500 pieces of debris weighing 84,800 pounds, almost 40 percent of the total dry weight of the shuttle. About 25,000 personnel took part, utilizing almost 1.5 million total man-hours in the recovery effort and involving more than 130 federal, state and local agencies. The operation was also supported by more than 270 organizations that included businesses and volunteer groups.

KENNEDY SPACE CENTER, FLA. - The Stafford-Covey Return to Flight Task Group (SCTG) inspects debris in the Columbia Debris Hangar. At right is the model of the left wing that has been used during recovery operations. Chairing the task group are Richard O. Covey, former Space Shuttle commander, and Thomas P. Stafford (third from right, foreground), Apollo commander. Chartered by NASA Administrator Sean O’Keefe, the task group will perform an independent assessment of NASA’s implementation of the final recommendations by the Columbia Accident Investigation Board.

KENNEDY SPACE CENTER, FLA. - In the Columbia Debris Hangar, members of the Stafford-Covey Return to Flight Task Group (SCTG) look at tiles recovered. Chairing the task group are Richard O. Covey, former Space Shuttle commander, and Thomas P. Stafford (center), Apollo commander. Chartered by NASA Administrator Sean O’Keefe, the task group will perform an independent assessment of NASA’s implementation of the final recommendations by the Columbia Accident Investigation Board.

KENNEDY SPACE CENTER, FLA. - While talking to the media, Shuttle Launch Director Mike Leinbach points to some of the investigative tools in the RLV Hangar, where Columbia debris is being examined. The items shipped to KSC number more than 82,000 and weigh 84,800 pounds or 38 percent of the total dry weight of Columbia. Of those items, 78,760 have been identified, with 753 placed on the left wing grid in the Hangar.

KENNEDY SPACE CENTER, FLA. - The Stafford-Covey Return to Flight Task Group (SCTG) visits the Columbia Debris Hangar . Chairing the task group are Richard O. Covey (third from right), former Space Shuttle commander, and Thomas P. Stafford (fourth from right), Apollo commander. Chartered by NASA Administrator Sean O’Keefe, the task group will perform an independent assessment of NASA’s implementation of the final recommendations by the Columbia Accident Investigation Board.

KENNEDY SPACE CENTER, FLA. - In the Columbia Debris Hangar, Shuttle Launch Director Mike Leinbach (left) talks to members of the Stafford-Covey Return to Flight Task Group (SCTG) about reconstruction efforts. Chairing the task group are Richard O. Covey (second from right), former Space Shuttle commander, and Thomas P. Stafford, Apollo commander. Chartered by NASA Administrator Sean O’Keefe, the task group will perform an independent assessment of NASA’s implementation of the final recommendations by the Columbia Accident Investigation Board.

KENNEDY SPACE CENTER, FLA. - In the Columbia Debris Hangar, Shuttle Launch Director Mike Leinbach answers questions from the Stafford-Covey Return to Flight Task Group (SCTG). Chairing the task group are Richard O. Covey (fifth from left), former Space Shuttle commander, and Thomas P. Stafford, Apollo commander. Chartered by NASA Administrator Sean O’Keefe, the task group will perform an independent assessment of NASA’s implementation of the final recommendations by the Columbia Accident Investigation Board.

KENNEDY SPACE CENTER, FLA. - In the Columbia Debris Hangar, members of the Stafford-Covey Return to Flight Task Group (SCTG) inspect some of the debris. Chairing the task group are Richard O. Covey, former Space Shuttle commander, and Thomas P. Stafford (fourth from left), Apollo commander. Chartered by NASA Administrator Sean O’Keefe, the task group will perform an independent assessment of NASA’s implementation of the final recommendations by the Columbia Accident Investigation Board.

KENNEDY SPACE CENTER, FLA. - In the RLV Hangar, NASA Administrator Sean O'Keefe (left) is briefed on the status of the Space Shuttle Columbia accident investigation by Steve Altemus, a member of the Columbia Reconstruction Project Team. To date, more than 70,000 items have been delivered to KSC for use in the ongoing mishap investigation.

KENNEDY SPACE CENTER, FLA. -- Members of the Columbia Reconstruction Project Team move a piece of Columbia debris across the grid in the RLV Hangar. The team is examining Columbia materials and will attempt to reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. -- Members of the Columbia Accident Investigation Board examine pieces of Columbia debris in the RLV Hangar. The debris was shipped from the collection point at Barksdale Air Force Base, Shreveport, La. As part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven, workers will attempt to reconstruct the orbiter inside the RLV.

KENNEDY SPACE CENTER, FLA. -- Retired Navy Admiral Harold W. Gehman Jr. (left front), chairman of the Columbia Accident Investigation Board, talks to KSC Shuttle Launch Director Michael Leinbach in the RLV Hangar where the Columbia debris is being organized. The debris was shipped from the collection point at Barksdale Air Force Base, Shreveport, La. As part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven, workers will attempt to reconstruct the orbiter inside the RLV.

KENNEDY SPACE CENTER, FLA. -- Members of the Columbia Accident Investigation Board examine a piece of Columbia debris in the RLV Hangar. The debris was shipped from the collection point at Barksdale Air Force Base, Shreveport, La. As part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven, workers will attempt to reconstruct the orbiter inside the RLV.

KENNEDY SPACE CENTER, FLA. -- Members of the Columbia Accident Investigation Board examine a piece of Columbia debris in the RLV Hangar. The debris was shipped from the collection point at Barksdale Air Force Base, Shreveport, La. As part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven, workers will attempt to reconstruct the orbiter inside the RLV.

KENNEDY SPACE CENTER, FLA. -- Members of the Columbia Accident Investigation Board examine a piece of Columbia debris in the RLV Hangar. The debris was shipped from the collection point at Barksdale Air Force Base, Shreveport, La. As part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven, workers will attempt to reconstruct the orbiter inside the RLV.

KENNEDY SPACE CENTER, FLA. -- Members of the Columbia Accident Investigation Board examine a piece of Columbia debris in the RLV Hangar. The debris was shipped from the collection point at Barksdale Air Force Base, Shreveport, La. As part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven, workers will attempt to reconstruct the orbiter inside the RLV.

KENNEDY SPACE CENTER, FLA. - In the RLV Hangar, a member of the Columbia Reconstruction Project Team tries to identify a piece of debris from Columbia. More than 70,000 items have been delivered to KSC for use in the mishap investigation.

KENNEDY SPACE CENTER, FLA. - In the RLV Hangar, a member of the Columbia Reconstruction Project Team examines a large piece of debris from Columbia. More than 70,000 items have been delivered to KSC for use in the mishap investigation.

KENNEDY SPACE CENTER, FLA. - In the RLV Hangar, a member of the Columbia Reconstruction Project Team examines debris from Columbia. More than 70,000 items have been delivered to KSC for use in the mishap investigation.

KENNEDY SPACE CENTER, FLA. - Members of the Columbia Reconstruction Program Team record debris from Columbia after its arrival at the KSC RLV Hangar. Workers are attempting to reconstruct the orbiter inside the hangar as part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven returning from mission STS-107.

KENNEDY SPACE CENTER, FLA. - In the RLV Hangar, a member of the Columbia Reconstruction Project Team examines a piece of debris from Columbia. More than 70,000 items have been delivered to KSC for use in the mishap investigation. A portion of them sit on the floor within the grid and outline of Columbia.

Another shipment of Columbia debris arrives at the KSC RLV Hangar. Inside, the Columbia Reconstruction Project Team is identifying pieces and placing them on a floor grid in a configuration of the orbiter. The team will attempt to reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. -- -- Members of the Columbia Reconstruction Program Team pass a light over debris from Columbia. Workers are attempting to reconstruct the orbiter inside the hangar as part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven returning from mission STS-107.

KENNEDY SPACE CENTER, FLA. - Two members of the Columbia Reconstruction Project Team examine a piece of Columbia debris on a table in the KSC RLV Hangar. The team is attempting to identify the debris and reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. -- Another closeup of the floor in the RLV Hangar shows the variety of Columbia debris gathered there. The Columbia Reconstruction Project Team is attempting to reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. -- - Two members of the Columbia Reconstruction Project Team examine a piece of Columbia debris, comparing it to a drawing of the orbiter. The team is attempting to identify the debris and reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. -- In the RLV Hangar, members of the Columbia Reconstruction Project Team place a piece of Columbia debris on the floor grid. The team is attempting to reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. - Large pieces of Columbia debris are shown, situated on the floor grid of the KSC RLV Hangar. The Columbia Reconstruction Project Team is attempting to identify the debris and reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. - Members of the Columbia Reconstruction Project Team look at a piece of Columbia debris. The team is identifying pieces and placing them on a floor grid in a configuration of the orbiter. The team will attempt to reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. - A closeup of the floor in the RLV Hangar shows the variety of Columbia debris gathered there. The Columbia Reconstruction Project Team is attempting to reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. -- In the RLV Hangar, the floor grid is marked with a growing number of pieces of Columbia debris. The Columbia Reconstruction Project Team will attempt to reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. -- An overview of the RLV Hangar floor shows pieces of Columbia that have been identified and placed within the outline of the orbiter. The Columbia Reconstruction Project Team is attempting to reconstruct the bottom of the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. -- Members of the Columbia Reconstruction Program Team record debris from Columbia after its arrival at the KSC RLV Hangar. Workers are attempting to reconstruct the orbiter inside the hangar as part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven returning from mission STS-107.

KENNEDY SPACE CENTER, FLA. -- In the RLV Hangar, members of the Columbia Reconstruction Project Team look at Columbia debris placed on the floor grid. The team is attempting to reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. -- Members of the Columbia Reconstruction Project Team look at a piece of Columbia debris placed on the floor grid of the RLV Hangar. The team will attempt to reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. - In the RLV Hangar, members of the Columbia Reconstruction Project Team look at several pieces of debris from Columbia. More than 70,000 items have been delivered to KSC for use in the mishap investigation. A portion of them sit on the floor within the grid and outline of Columbia.

KENNEDY SPACE CENTER, FLA. - A member of the Columbia Reconstruction Project Team examines a piece of Columbia debris on the floor of the KSC RLV Hangar. The team is attempting to identify the debris and reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. -- - A member of the Columbia Reconstruction Project Team examines a piece of Columbia debris on a table in the KSC RLV Hangar. The team is attempting to identify the debris and reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. - In the RLV Hangar, Adm. Harold Gehman, center, chairman of the Columbia Investigation Accident Board, looks on while U.S. Representative Dave Weldon (second from right) points at a piece of Columbia debris. Behind Gehman is U.S. Representative Tom Feeney. Gehman and other board members are visiting KSC as part of the ongoing investigation. Recovery efforts as of May 5 included 82,500 pieces of debris weighing 84,800 pounds, almost 40 percent of the total dry weight of the shuttle. About 25,000 personnel took part, utilizing almost 1.5 million total man-hours in the recovery effort and involving more than 130 federal, state and local agencies. The operation was also supported by more than 270 organizations that included businesses and volunteer groups.

KENNEDY SPACE CENTER, FLA. - In the RLV Hangar, Adm. Harold Gehman, center, chairman of the Columbia Investigation Accident Board, gestures toward a large piece of Columbia debris. He and other board members are visiting the Hangar as part of the ongoing investigation. At right is U.S. Representative Dave Weldon; behind him is U.S. Representative Tom Feeney. Recovery efforts as of May 5 included 82,500 pieces of debris weighing 84,800 pounds, almost 40 percent of the total dry weight of the shuttle. About 25,000 personnel took part, utilizing almost 1.5 million total man-hours in the recovery effort and involving more than 130 federal, state and local agencies. The operation was also supported by more than 270 organizations that included businesses and volunteer groups.

KENNEDY SPACE CENTER, FLA. - Adm. Harold Gehman, center, chairman of the Columbia Investigation Accident Board, looks at a large piece of Columbia debris in the RLV Hangar. He and other board members are visiting the Hangar as part of the ongoing investigation. To the right of Gehman are U.S. Representatives Tom Feeney and Dave Weldon. Recovery efforts as of May 5 included 82,500 pieces of debris weighing 84,800 pounds, almost 40 percent of the total dry weight of the shuttle. About 25,000 personnel took part, utilizing almost 1.5 million total man-hours in the recovery effort and involving more than 130 federal, state and local agencies. The operation was also supported by more than 270 organizations that included businesses and volunteer groups.

KENNEDY SPACE CENTER, FLA. - Adm. Harold Gehman, center left, chairman of the Columbia Investigation Accident Board, and U.S. Representative Tom Feeney, center right, are shown pieces of Columbia debris collected in the KSC RLV Hangar. Other members of the board accompanied Gehman as part of the ongoing investigation. Recovery efforts as of May 5 included 82,500 pieces of debris weighing 84,800 pounds, almost 40 percent of the total dry weight of the shuttle. About 25,000 personnel took part, utilizing almost 1.5 million total man-hours in the recovery effort and involving more than 130 federal, state and local agencies. The operation was also supported by more than 270 organizations that included businesses and volunteer groups.

KENNEDY SPACE CENTER, FLA. - Adm. Harold Gehman, center left, chairman of the Columbia Investigation Accident Board, and U.S. Representative Tom Feeney, center right, are shown pieces of Columbia debris collected in the KSC RLV Hangar. Other members of the board accompanied Gehman as part of the ongoing investigation. Recovery efforts as of May 5 included 82,500 pieces of debris weighing 84,800 pounds, almost 40 percent of the total dry weight of the shuttle. About 25,000 personnel took part, utilizing almost 1.5 million total man-hours in the recovery effort and involving more than 130 federal, state and local agencies. The operation was also supported by more than 270 organizations that included businesses and volunteer groups.

KENNEDY SPACE CENTER, FLA. -- In the RLV Hangar, members of the Columbia Reconstruction Project Team look at Columbia debris shipped from Barksdale AFB, Shreveport, La. Barksdale continues to be the receiving and shipping point for Columbia materials being sent to KSC for final identification. Inside the RLV Hangar, the Columbia Reconstruction Project Team will attempt to reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. -- In the RLV Hangar, members of the Columbia Reconstruction Project Team examine the latest pieces of Columbia debris shipped from Barksdale AFB, Shreveport, La. Barksdale continues to be the receiving and shipping point for Columbia materials being sent to KSC for final identification. Inside the RLV Hangar, the Columbia Reconstruction Project Team will attempt to reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. - In the RLV Hangar, members of the Columbia Reconstruction Project Team look at a piece of Columbia debris shipped from Barksdale AFB, Shreveport, La. Barksdale continues to be the receiving and shipping point for Columbia materials being sent to KSC for final identification. Inside the RLV Hangar, the Columbia Reconstruction Project Team will attempt to reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. - In the RLV Hangar, Adm. Harold Gehman, chairman of the Columbia Investigation Accident Board, points to data on a chart. He and other board members are visiting as part of the ongoing investigation. Recovery efforts as of May 5 included 82,500 pieces of debris weighing 84,800 pounds, almost 40 percent of the total dry weight of the shuttle. About 25,000 personnel took part, utilizing almost 1.5 million total man-hours in the recovery effort and involving more than 130 federal, state and local agencies. The operation was also supported by more than 270 organizations that included businesses and volunteer groups.

KENNEDY SPACE CENTER, FLA. - Two members of the Columbia Reconstruction Project Team measure a piece of Columbia debris collected and shipped from Barksdale Air Force Base, Shreveport, La. The Columbia Reconstruction Project Team is identifying pieces and placing them on the grid in a configuration of the orbiter. The team will attempt to reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. -- In the RLV Hangar, members of the Columbia Reconstruction Project Team look at a stack of Columbia debris shipped from Barksdale AFB, Shreveport, La. Barksdale continues to be the receiving and shipping point for Columbia materials being sent to KSC for final identification. The team is attempting to reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. -- Another shipment of Columbia debris is offloaded at the KSC RLV Hangar after transport from Barksdale AFB, Shreveport, La. Barksdale continues to be the receiving and shipping point for Columbia materials being sent to KSC for final identification. Inside the RLV Hangar, the Columbia Reconstruction Project Team will attempt to reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. - A fish-eye view in the RLV Hangar shows the growing number of pieces of Columbia debris shipped from Barksdale AFB, Shreveport, La. Barksdale continues to be the receiving and shipping point for Columbia materials being sent to KSC for final identification. The Columbia Reconstruction Project Team is attempting to reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. -- In the RLV Hangar, members of the Columbia Reconstruction Project Team examine a large piece of Columbia debris shipped from Barksdale AFB, Shreveport, La. Barksdale continues to be the receiving and shipping point for Columbia materials being sent to KSC for final identification. The team is attempting to reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. - In the RLV Hangar, Shuttle Test Director Steve Altemus (left), a member of the Columbia Reconstruction Project Team, discusses the status of the investigation into the Space Shuttle Columbia accident with NASA Administrator Sean O'Keefe (right). To date, more than 70,000 items have been delivered to KSC for use in the ongoing mishap investigation.

KENNEDY SPACE CENTER, FLA. - In the RLV Hangar, NASA Administrator Sean O'Keefe (second from left) discusses the status of the investigation into the Space Shuttle Columbia accident with Shuttle Launch Director Mike Leinbach (center) and Shuttle Test Director Steve Altemus (right), both members of the Columbia Reconstruction Project Team. To date, more than 70,000 items have been delivered to KSC for use in the ongoing mishap investigation.

KENNEDY SPACE CENTER, FLA. - In the RLV Hangar, NASA Administrator Sean O'Keefe (left) listens to a report from Shuttle Test Director Steve Altemus, a member of the Columbia Reconstruction Project Team, on the status of the investigation into the Space Shuttle Columbia accident. To date, more than 70,000 items have been delivered to KSC for use in the ongoing mishap investigation.

KENNEDY SPACE CENTER, FLA. - In the RLV Hangar, NASA Administrator Sean O'Keefe (left) is briefed on the status of the investigation into the Space Shuttle Columbia accident by Shuttle Launch Director Mike Leinbach (center) and Shuttle Test Director Steve Altemus (right), both members of the Columbia Reconstruction Project Team. To date, more than 70,000 items have been delivered to KSC for use in the ongoing mishap investigation.

KENNEDY SPACE CENTER, FLA. - In the RLV Hangar, NASA Administrator Sean O'Keefe (second from left) listens as Shuttle Launch Director Mike Leinbach (center) explains an aspect of the investigation into the Space Shuttle Columbia accident. On the right is Shuttle Test Director Steve Altemus, a member of the Columbia Reconstruction Project Team. To date, more than 70,000 items have been delivered to KSC for use in the ongoing mishap investigation.

KENNEDY SPACE CENTER, FLA. - In the RLV Hangar, several pieces of debris from Columbia are being examined. More than 70,000 items have been delivered to KSC for use in the mishap investigation. A portion of them sit on the floor within the grid and outline of Columbia.

KENNEDY SPACE CENTER, FLA. - Columbia debris is spread across the grid in the RLV Hangar at KSC. Workers are attempting to reconstruct the orbiter inside the hangar as part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven returning from mission STS-107. .

KENNEDY SPACE CENTER, FLA. -- Members of the Columbia reconstruction team look at a diagram on the floor of the RLV Hangar. In the background are pieces of the Columbia debris being examined and recorded. As part of the ongoing investigation into the tragic accident, workers will attempt to reconstruct the orbiter inside the RLV.

KENNEDY SPACE CENTER, FLA. -- This view inside the RLV Hangar at KSC shows the placement on the floor of some of the debris from Columbia. Workers are attempting to reconstruct the orbiter inside the hangar as part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven returning from mission STS-107.

KENNEDY SPACE CENTER, FLA. - The mission patch for STS-107 is displayed, left, on the outside of the RLV Hangar at KSC. The hangar is the site of the Columbia Reconstruction Project, where pieces of debris from Columbia are being collected and identified as part of the mishap investigation.

KENNEDY SPACE CENTER, FLA. -- Columbia debris continues to arrive at the RLV Hangar at KSC. Workers are attempting to reconstruct the orbiter inside the hangar as part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven returning from mission STS-107. .

KENNEDY SPACE CENTER, FLA. -- Columbia debris continues to arrive at the RLV Hangar at KSC. Workers are attempting to reconstruct the orbiter inside the hangar as part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven returning from mission STS-107. .

KENNEDY SPACE CENTER, FLA. -- A long view inside the RLV Hangar shows the grid on the floor and placement of some of the debris from Columbia. Workers are attempting to reconstruct the orbiter inside the hangar as part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven returning from mission STS-107.

KENNEDY SPACE CENTER, FLA. - This view inside the RLV Hangar at KSC shows the grid on the floor and placement of some of the debris from Columbia. Workers are attempting to reconstruct the orbiter inside the hangar as part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven returning from mission STS-107.

KENNEDY SPACE CENTER, FLA. - Workers lower their bucket after placing the final piece of the mission patch for STS-107 on the outside of the RLV Hangar at KSC. The hangar is the site of the Columbia Reconstruction Project, where pieces of debris from Columbia are being collected and identified as part of the mishap investigation.

KENNEDY SPACE CENTER, FLA. -- Columbia debris continues to arrive at the RLV Hangar at KSC. Workers are attempting to reconstruct the orbiter inside the hangar as part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven returning from mission STS-107.

KENNEDY SPACE CENTER, FLA. - A member of the Columbia Reconstruction Project Team examines a graphic display of the orbiter in the KSC RLV Hangar. The team is attempting to identify the debris and reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

Engineers are investigating the possibility that a 7/8" gold-plated liquid oxygen post plug became dislodged and created three small holes in the liquid hydrogen tubes inside the nozzle on main engine No. 3 on Space Shuttle Columbia. The holes caused a hydrogen leak during the STS-93 launch of Columbia on July 23

KENNEDY SPACE CENTER, FLA. - Workers are placing the mission patch for STS-107 on the outside of the RLV Hangar at KSC. The hangar is the site of the Columbia Reconstruction Project, where pieces of debris from Columbia are being collected and identified as part of the mishap investigation.

KENNEDY SPACE CENTER, FLA. - Workers place the final piece of the mission patch for STS-107 on the outside of the RLV Hangar at KSC. The hangar is the site of the Columbia Reconstruction Project, where pieces of debris from Columbia are being collected and identified as part of the mishap investigation. In the background, at right, is the Vehicle Assembly Building.

KENNEDY SPACE CENTER, FLA. - Workers place the final piece of the mission patch for STS-107 on the outside of the RLV Hangar at KSC. The hangar is the site of the Columbia Reconstruction Project, where pieces of debris from Columbia are being collected and identified as part of the mishap investigation.

Engineers are investigating the possibility that a 7/8" gold-plated liquid oxygen post plug became dislodged and created three small holes in the liquid hydrogen tubes inside the nozzle on main engine No. 3 on Space Shuttle Columbia. The holes caused a hydrogen leak during the STS-93 launch of Columbia on July 23

KENNEDY SPACE CENTER, FLA. -- Columbia debris continues to arrive at the RLV Hangar at KSC. Workers are attempting to reconstruct the orbiter inside the hangar as part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven returning from mission STS-107. .

Shuttle Program Manager Ron Dittemore (leaning over) examines a piece of Columbia debris in the RLV Hangar. The debris was shipped from the collection point at Barksdale Air Force Base, Shreveport, La. As part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven, workers will attempt to reconstruct the orbiter inside the RLV.

KENNEDY SPACE CENTER, FLA. - Workers place the final piece of the mission patch for STS-107 on the outside of the RLV Hangar at KSC. The hangar is the site of the Columbia Reconstruction Project, where pieces of debris from Columbia are being collected and identified as part of the mishap investigation.

KENNEDY SPACE CENTER, FLA. - The mission patch for STS-107 is displayed, left, on the outside of the RLV Hangar at KSC. The hangar is the site of the Columbia Reconstruction Project, where pieces of debris from Columbia are being collected and identified as part of the mishap investigation.

Shuttle Program Manager Ron Dittemore (leaning over) examines a piece of Columbia debris in the RLV Hangar. The debris was shipped from the collection point at Barksdale Air Force Base, Shreveport, La. As part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven, workers will attempt to reconstruct the orbiter inside the RLV.

Columbia Reconstruction Project Team members study diagrams to aid in the placement of debris from the Space Shuttle Columbia in the RLV Hangar. The debris is being shipped to KSC from the collection point at Barksdale Air Force Base, Shreveport, La. As part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven, workers will attempt to reconstruct the orbiter inside the hangar.

KENNEDY SPACE CENTER, FLA. - A grid on the floor of the RLV Hangar is filling up with pieces of Columbia debris that have been collected by workers in the field. The blue lines reflect the outline of the orbiter. The Columbia Reconstruction Project Team is identifying pieces and placing them on the grid approximating their location on the orbiter to facilitate the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth following mission STS-107. To date, about 25 percent of the orbiter has been delivered to the hangar.

KENNEDY SPACE CENTER, FLA. -- Columbia Reconstruction Project Team members examine pieces of debris from the Space Shuttle Columbia for cataloging in the RLV Hangar. The debris is being shipped to KSC from the collection point at Barksdale Air Force Base, Shreveport, La. As part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven, workers will attempt to reconstruct the orbiter inside the hangar.

Columbia Reconstruction Project Team members cautiously examine potentially hazardous debris from the Space Shuttle Columbia in the RLV Hangar. The debris is being shipped to KSC from the collection point at Barksdale Air Force Base, Shreveport, La. As part of the ongoing investigation into the tragic accident that claimed Columbia and her crew of seven, workers will attempt to reconstruct the orbiter inside the hangar.

KENNEDY SPACE CENTER, FLA. - Another shipment of Columbia debris is being offloaded at the KSC RLV Hangar. Inside, the Columbia Reconstruction Project Team is identifying pieces and placing them on a floor grid in a configuration of the orbiter. The team will attempt to reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia and loss of its crew as it returned to Earth on mission STS-107.

KENNEDY SPACE CENTER, FLA. -- A member of the Columbia Restoration Project Team places a piece of debris on the floor of the RLV Hangar at KSC. A fourth shipment of Columbia debris has arrived at KSC. The team is examining pieces and attempting to reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia as it returned to Earth on mission STS-107. To date, four shipments have arrived from Barksdale AFB, Shreveport, La., the collection point for debris.