Can’t help w/ the paddle design, but I’ve worked up a couple of U.S. Navy designs:
- USN Masterdiver: Need help creating / editing a picture - #5 by WillAdams
- Nvy logo svg file
- Drew up a rough version of the U.S. Navy Submarine Warfare Insignia
and there are more at:
https://elements.carbide3d.com/category/us_armed_forces/
c.f.,