Hanau Signal Depot (Source: US Army Photo) Brig. Gen. Basil H. Perry, commanding general, Frankfurt Military Post, entering the motor pool, Hanau Signal Depot, during his inspection of that installation on 5 April 1951. (NOTE: preceding comments are the official Signal Corps description of the photo. Looking at the aerial photo of the Signal Depot from 1950, I believe that the General is in the process of "leaving" the motor pool.)