It is a training screener for Mids so they can do summer training with MARSOC units. It is the model they use for the Mini-Buds screener. USNA has only so many slots for summer training for these schools and they want to ensure we send the best. So they hold screeners to compete. They usually consist of a PT test, tons and tons of PT, high stress environments, more PT, no sleep, generally run 24-48 hours long, more PT, usually if done in the winter then it involves cold. It tends to be cold, wet, and very tiring. Some will drop out of it. Last I checked they do screeners for MARSOT, Mini Buds, Dive School and I heard they might do them for EOD/Diving Summer Cruises. They are generally run with a cadre of officers and senior enlisted from their respective warfare communities.