IIRC, the C-130 started out in 1954 and there are a ton of variations. But the models I've flown in had multiple observation windows along the sides. This is just to see things on the sides of the plane that the crew up front cant. Seeing where the bad guys are that keep shooting at you, what the weather is like outside, where the closest golf course and liquor store are. Depends on the mission...
TP