Honestly, let's get them out to the easiest ones (the young/new guys) right away.
Us old coots don't need an extra badge to lose to show our experience/skill.
The young'uns need some recognition before us old guys do, and it'll be easier to calculate the days for a kid with 1 posting to a ship, than a guy like me with 6 different sea-going postings on 5 ships over the span of 18 years....
Recognize the efforts of the new guys, give them something to put up on their uniform....we don't give the SSM(NATO) anymore, so having something for 'em would be good.
NS