This sounds like an urban legend and I don't know if this is true or not, but my former Navy squadron replaced its C-9s with C-40s, which are highly modified 737-700s. The first couple had the eyebrows but the third did not. When we asked about it we were told that the windows go back to the 1960's when celestial navigation and sextant shots were considered a viable back-up emergency navigation method. The eyebrow windows seem a little small for that purpose but then again I don't know much about celestial navigation or using a sextant. I'm sure some old timers can weigh in on whether this is true or not.

Scoop