[LT Guppy]

So, my CMC at my last command was an HM. He had 6 warfare pins....
(FMF, ESWS, Expeditionary, Diver, Jumper, Dolphins) He was also an IDC. He's served withe the Navy, Marines, and Army (all as a sailor - he didn't cross branches). He's also an instructor.
... just to give you an idea of what's possible...