I highly recommend a CRITICAL reading of Pershing's memoirs from "The Great War".

Please brush off your old college notes about the advantages and disadvantages of first person accounts of events.

In it Pershing explains his version of the how and why he organized, trained, and employed the AEF the way he did. His line and box chart expansion of the Army was pretty innovative. The AEF had its own staff course in theater.

Another really fascinating section is on the re-establishment of large organizations using conventional tactics when the Army was at the time a small wars endeavor scattered across the frontier. So, as Gian likes to remind us, there are problems inherent in having a force that is overwhelmingly conducting non-conventional missions, then having a big balloon go up.