You could be right, but I've spent a fair amount of time at AFA and have never heard anyone called a plebe.
Doolies are another matter.
ETA, I did a Google search on "Plebes" and came up with the following:
http://www.answers.com/main/ntquery;...linktext=plebs
According to this, Plebe is used at West Point, Annapolis and the Merchant Marine Academy, and AFA uses "Doolie" which was a class below a plebe in Roman societies.
(Be sure to read to the bottom of that page which is where the Service Academies are mentioned.
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