I think it has to do with the "dreaded 3 engine landing" mentality. Both airframes (KC-130 and P-3) have four engines. Every other example is a 2 engine a/c. An engine loss in a 60, 46, C-2, E-2, F/A-18, etc... is a serious god-damn deal. So by the time you're signing for it, you better be...