"As an outgrowth of Bill Weaver's inability to see out of his faceplate from the ice buildup, futre SR-71 ejection seats incorporated a battery pack that contin

"As an outgrowth of Bill Weaver's inability to see out of his faceplate from the ice buildup, futre SR-71 ejection seats incorporated a battery pack that continued to keep the glass faceplate heated during the frigid descent." The amount of engineering and refinement that goes into these safety systems really amazes me. They learn from everything in aviation and put it to good use.