If there is an invitation, it should specify a uniform for mil guests. That said, if you know you need to be in uniform and have no idea what uniform to wear, wear SDBs. Navy SDBs or Marine Service Alphas are the default "No one told me what uniform to wear uniform." As long as you're not showing up to turn wrenches, everyone knows this, and should not give you too much of a hard time.To piggy back the question what about to my buddy's marine boot camp graduation? I figured SDBs but I'm new to this dance and don't want to look like I'm strutting through Parris island like a tool.
There should be a POC somewhere who is handling the families' and friends' dumb questions, though.