I know this gets said a lot, but I really did search through the comments to see if anyone else had noticed this/had said what it was.

I don't know what it is, either. It's driving me insane. It looks like fingers but whose would they be??

Now I'm imagining all these tough nut Navy men with their shirts above their bellybutton, each getting a finger poked into their belly making them do the Pillsbury "Hmhmmm!" laugh lol