Just happened to pop in and saw this post....the 23rd officer is a good friend of mine, although I won't ID him. The first photo you have of him is at Williamsburg, probably this year as he was Officer of the Guard and I was Sjt. of the Guard on the day the photo was taken. The second photo at Yorktown is the same 23rd officer and the Major of the 42nd RHR, also a good friend of mine. IN fact, in the photo at Yorktown, I am off to their right, out of the photo, as I remember the photos being taken. That was at the 225th anniv. of Yorktown where I was serving as Army Sjt. Major. YES, to the answer of the Gorget and they are only worn when an officer is on duty.

Malcolm MacWm., 42nd RHR GrenCoy
ASM, British Brigade
www.britishbrigade.org