What's with the glass chin? You'll notice if you look closely that the IL-76, like a number of old Soviet aircraft, has glass in the lower-half of its nose. This was specially made for a navigator to be able to have an excellent view of the outside, especially when landing.

The iconic "glass nose" seen on Soviet-era aircraft like the Tupolev Tu-134, Tu-104, and the Ilyushin Il-76 was designed to house the navigator. This was a practical necessity for flying over the vast, remote expanses of the Soviet Union and Siberia, where radio navigation beacons were often sparse or non-existent in the mid-20th century. The navigator sat in the glass-bottomed nose to perform "dead reckoning" and visual navigation, literally looking at the ground to match landmarks with maps or using a sextant for celestial navigation. Additionally, many of these planes had military origins or were designed to be "dual-use"; the glass nose allowed for easy conversion into a bomber or specialized transport where a bombardier would need a clear view of the target. As technology advanced and ground-based radar and satellite navigation became standard, newer Russian aircraft phased out the glass nose in favor of a traditional solid radome.