The signature matches the documents in Irving Buck's file On Fold 3. This was an archaic way of signing the letter "I" back then - which often looked like a "J." The last name is just stretched out - but trust me - there is no JA Birch on Cleburne's staff - his AAG was Irving A. Buck, some of whose documents were signed I.A. Buck.
This requisition was for Cleburne's HQ flag.
Greg Biggs