Okay, I'm here...been working today at the battlefield, in an ironic twist to this thread.

Yes, there was a kilted regiment in American military history -- the 79th New York Highlanders, which was a New York State Militia unit before the Civil War that based it's uniform on the Cameron Highlanders, even taking the same numerical desgination, 79th, and wearing the Cameron of Erract tartan -- but, there seems to be little evidence that the 79th actually wore their kilts into battle during the Civil War, save for one or two officers. Very few surving examples of the 79th's uniform (one is in the museum at Gettysburg, for example).

Apart from the occasional pipe band, such as the US Air Force or the 7th Cavalry's pipe band in the 1970's, the US simply doesn't have the Highland regimental traditions that the British Army and other Commonwealth nations, like Canada, South Africa, Australia, etc. have -- yes, we have tartans for our branches of service, and all that, but these are relatively modern (which isn't a bad thing at all; I'm glad to see them).

Hope that helps.

Cheers.

Todd