Wedding invitation to retired military

Dear Limo Princess,
What is the correct way to address an lenvelope containing a wedding invitation for a retired military person and his wife? We have retired Colonel and his wife and a retired Lt. Colonel and his wife. Thank you. Carol Jean

Dear Carol Jean,
It really depends on the person. While they are entitled to be addressed by their previous military rank, many retired military choose not to be--case in point my father-in-law who prefers to be "Mr." and not "Colonel". Either way is correct though, so fear not--you will not be committing a faux pas either way.
Have a wonderful time at the wedding!
LimoPrincess