Columbia disaster
Over the last three years, NASA has spent an estimated $1.3 billion to remedy the foam problem. When asked about the foam concern, NASA Associate Administrator Bill Gerstenmaier said, "We're about the same risk as we were before ... I don't think we're taking any additional risks." Officials have said that they expect foam to fall during the launch though. A few senior NASA safety and technical officers have their voiced opposition to the launch, claiming that they need more time to work on the foam-shedding problem. Foam debris coming loose was the cause of the 
 in 2003. 
NASA to launch Discovery despite crack in insulation foam