WEGL12
VT-28
I believe ship selection is just the group of SWO's getting together with a list of available ships and they figure out who wants to go where. Never heard of it being based on class rank. Also class rank at OCS does not matter, once you commission everyone is an Ensign and has a fresh start. I know a few people that thought OCS was the Navy (it's not) and others like myself did well and cared only about getting through not class rank.
I know in my class the SWOs used class rank to determine who went where. Might be a different situation because there were only five people selecting and three of them wanted the same ship. But I know one guy that got selected for a ship he didn't want was because of his class rank.