Every Navy personnel have to take a sort of swimming test.This is to see how well you can swim. If u can't swim, they will most likely send you back to army.Simple right? Just like when u are in the circus stage, u can't perform and they will kick u out.I Like Navy as well as Airforce, but not Army.I will explain that when days to come.
CAT tests are supervised by Physical Training Instructor.At least 1 life guard is there to make sure safety precautions are made.