Need help deciphering WWI US Army Officer Commission Card

[OhioBright86]

The person at NARA provided me with my Great Grand father Officer Commission Card which has lead me deeper into the 166th Infantry and 308th Infantry units and I was wondering if someone could help be decipher the hand writing. In the Remarks Line circled in red.

I think it says "Pershing S.O. 272/1 or 272/4 which is a Special Order."

And "Special Order 154/8 Hq Camp Sherman, O.

I was wondering where I would find Special Orders at the NARA? Would it be under the unit he was transferred or in Headquarters orders ?. Trying to pin down some references. I have an idea possible in the 120.4 RECORDS OF THE ADMINISTRATIVE STAFF, GHQ AEF not sure