OT- FM 1/C Vernon L. Castle USMC - fun question

[Jim Tarleton]

FM 1/C Vernon L. Castle was a Marine Raider who was killed and his body left on the Makin Atoll and later recovered with his weapon (03?). What was this Marine's rank?

Hints: If you are a China Marine history buff, you might already know this rank. He was not in the Navy.

If you were one of the group who researched this rank, please refrain from posting, please. It took me some time to uncover this relatively uncommon Marine Corps rank, and I thought I knew them all. I was wrong!

There is a famous Navy boat that was in the news a few years ago that is named after a Marine of the same rank. Name the boat.

Semper Fi,
Jim

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