Which Trump officials were in the Signal chat? Here's who was in the group The Atlantic editor was added to

Washington — The Signal group chat that conveyed details of the timing and weapons descriptions of a planned attack against the Houthis in Yemen included the names or initials of 18 Trump officials and, of course, Atlantic editor-in-chief Jeffrey Goldberg, who published his account of the messages. 

A spokesperson for the National Security Council has confirmed that the message thread "appears to be authentic," and none of the reported participants has denied their appearance in the "Houthi PC small group" chat.

So who are the officials whose contacts appear in the Signal chat, and what do they do?