Most interesting "assignment, detail, or special duty?"

There are some absolutely amazing special assignments out there... what was yours? Perhaps it was a B-billet, a special assignment, an additional duty, detail, or career broadening experience; there are definitely many memorable, interesting, and rewarding military special duties and career expanding assignments out there. Perhaps it was your time on the drill field (drill instructor, sergeant instructor, drill sergeant, training instructor, etc.), ceremonial duty (color guard, drill team, honor guard, etc.), or an academic, diplomatic, security detail, embassy duty, a special board or administrative duty, an interesting foreign assignment, or perhaps it was just an exciting and completely out-of-the-ordinary duty or assignment. Please feel free to share any descriptions, photos, links, websites, or anything else necessary to help tell your story; I'm absolutely certain that this will be an interesting and enlightening discussion, so pull up a keyboard and let's get this thing started, thank you for all that you do, and... see you all in the discussion threads!