red propeller

[Hawk200]

Most Navy squadron patches are round. Ship patches vary. Shore stations and headquarters type commands are primarily triangular. Some older irregular shapes are grandfathered.

Just out of curiosity, those are primarily worn on flight clothing, aren't they?

[SarDragon]

That is correct, and on various outerwear having patches authorized. I admit to not having detailed knowledge of the current rules, but there are fewer opportunities to wear patches than WIWOAD.