Earlier flight jackets were made from fabrics that were found to melt when a pilot was caught in a fire. As technology improved, there was a need for a fire-retardant jacket. This led to the rise of the CWU (Cold Weather Uniform) 36/P and 45/P made from Nomex. Nomex was created by Dupont and is known for its excellent thermal, chemical, and radiation resistance. The military still issues Nomex jackets to Air Force pilots.

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