Two workers check paperwork about the wiring being installed in Discovery's cargo bay that will support the addition of an Orbiter Boom Sensor System.

In the Orbiter Processing Facility, two workers (center) check paperwork about the wiring being installed in Discovery’s cargo bay that will support the addition of an Orbiter Boom Sensor System (OBSS) . The OBSS is one of the new safety measures for Return to Flight, equipping the Shuttle with cameras and laser systems to inspect the Shuttle’s Thermal Protection System while in space. Discovery is designated as the Return to Flight vehicle for mission STS-114, no earlier than March 2005.