To reinforce the last two posts...Your next employer is going to employ YOU not the Rank you once had.
When they talk to you - they talk to your face not your shoulder badge.
When you talk to them - they only see a face not a history or a rank.
However, if you mention your rank or "When I.." too much your colleagues or employer could well play them back to you when you least want it.
You should only use Rank at a reunion.