None for me.. too chicken and just no desire for one.
My son-in-law has a few - he's a Marine and seems like many of them get them after they survive boot camp. He has a bulldog on each shoulder blade and USMC in between. He said he could choose who saw them this way. But .. last year he added three dolphins on his upper arm - they represent himself, his wife, and their son. Guess if they have another child he'll add another dolphin?
My daughter has the same tattoo between her shoulder blades. She's talked about getting one since she was 16 and she's 28 now. She had mentioned getting something to represent her family, but I was a bit surprised when she actually did it.