According to a film called "NASA Challenger: The Untold Story," which presents an example of Groupthink tells the explosion of the Space Shuttle Challenger on Jan 28, 1986. NASA managers were so committed to reaching space program objectives that they ignored safety warnings of the O-rings from people both within and outside the agency. As shown in the video, the outside temperature was too cold for the safe use of sealing rings. Not shown in the video was that a NASA briefing paper dated July 20, 1986, reported that both astronauts and engineers expressed concern that the agencys management had a group-think mentality.

Answer the following question  

Identify and apply with examples from the film clip NASA Challenger: 4 symptoms of Groupthink that were evident.