As a civilian you can address him as hey you!
His Rank has nothing to do with civilisn life!
But as a Soldier yes you better show respect!
His Title has no clout in Civilian life. But his record may show attributes of loyalty and honesty which are a requirement
in Military Life!
This does not mean this individual adheres to these attributes but shows he has shown certain elements that would acertain these aspects of Military life are in his scope of life.