I’ve heard of “silent r”, but never an “implied r”. I’m just an old fart and will stay with le-june. Let the gunny try to correct me.
http://www.caaflog.com/2010/07/16/camp-lejeune-the-r-is-implied-warning-non-military-justice-post/
We were there for 3 years and it was always pronounced Camp ‘La June’ Civilians and military pronounced it that way.