Found these at the stamp show on Saturday. Mailed from West Point to Stapleton, NY. From the dates and that they're from the Army Athletic Association, I believe they were used to mail tickets for the games.
The registered one would have held tickets to the Harvard game where one of the cadets was killed, leading to the cancellation of the rest of the season.
The recipient was also the postmaster at Stapleton, I haven't yet figured out if he had any connection to the academy besides being a football fan.
