Thanks. Anyone know the function of the white bump on this plane?
http://www.lazygranch.com/images/flags/r2007_1/c130_21.jpg

It's not a navigator's dome, it's a dome inserted in place of the forward 
escape hatch from which a crewmember can watch for hostiles or take some 
reallt cool air-to-air photography.
AFAIK, no C-130 has ever had a nav dome, using a periscope sextant instead. 
I'm sure even that's been made redundant by now.

Curt