The Library of Virginia's website included the War of 1812 Pay Rolls and Muster Rolls - Abbreviations for Ranks in their War of 1812 database. Examples include:
Aide de Camp A. D. Camp; A. D.; Aid.e; Aid
Adjutant Adj't.; Adj.; Ad.
Principal Forager Prin. Forager
Principal Forage Master P. F. Master
Principal Wagon Master P. W. Master
Riding Master R. Master; R. M.
Sword Master S. Master; S. M.