Basics from the Writing Style Guide
How to write the class year for the alumni and graduates:
The Georgetown University style guide establishes the convention for GUSY, or “Georgetown University school and year”. For the Bachelor of Science in Foreign Service (BSFS) degree at GU-Q, this would be John Smith (SFS’xx), with no space between the apostrophe and the last two digits of the graduating year. This convention is used in the official documentation for convocation and commencement collateral such as formal programs and invitations. For public and mass media, John Smith (GU-Q’xx) is used, to avoid confusion.
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