Geoff Nunberg, linguist, has claimed this about the pronunciation of nuclear as "nucular":
"this disaffectation is not uncommon among Pentagon and DOD types when they're referring to weapons, though not when they're referring to families or medicine."
http://languagelog.ldc.upenn.edu/nll/?p=673 Can that be true? Do they pronounce it as nucular in one context, but not in another?