I am 1/2 to 3/4 joking…I’m not really talking about “insignia” but the use of Velcro patches on sleeves and similar things. Don’t get me wrong, I love bling as much as the next fellow but these are official uniforms. The admiral @ChuckMK23 mentioned already shows some remarkable professional accomplishments with his dolphins other pin but the Nukes patch? I get MP and maybe MEDIC but EOD? Or, maybe, I am simply confusing the issue and should be asking…Why is a US Navy submarine admiral wearing a battlefield uniform?
That other pin is the Deep Submergence insignia. It's pretty cool: https://en.wikipedia.org/wiki/Deep_Submergence_insignia