We’re just back from another event on the downtown waterfront (call it the “tunnel defense” media briefing, story in the works) and didn’t know about this one till we found out on Twitter: A change of command ceremony is under way at US Coast Guard District 13 HQ at Pier 36 right now – with a 15-gun salute. Here’s a news release – but even better, you’ll find links to photos (like the one above) and running commentary from the District 13 public-affairs staff on Twitter at @uscgd13.