ai and support units

[caranorn]

I wonder, does the ai really know how to use support units? This is the second time during this game that I see the ai's Army of the Potomac marching around with a bunch of medical (5x), pioneer (5x) and signal (2x) units, not to forget the naval engineers (2x). Maybe my presence so close to it's capital (strongly dug in at Alexandria) is affecting it, alternatively it just doesn't know what to do with these units.

Edit: Forgot to attach the image.

[Pocus]

I know about this problem but never got the time to take a second look. She is not supposed to add more than one type per stack.