Hayley asked me to take her to see airplanes. So I did. It was my second day at the Expo.
The pilot (a major) had seen a periscopic sextant in its case, but never installed in the aircraft. He had never used one, or even seen one being used. I was standing there when another attendee asked him about the receptacle. I was able to explain what it did and how it was used. The major told me the receptacle is now used to release air if they get smoke in the cockpit, and to hold a satellite phone antenna.
Hayley was excited to see the two airplanes I used to work on, the KC-135R and Learjets.
Hayley wanted me to take a picture of these E-2 Hawkeye propellers. She said they look like large eyes surrounded with long eyelashes. I agree.