what i mean by totally unrelated is this...
Medical Checkup... to Determine PES status.
Napfa, to determine your lenght of service and whether you need to
attend PTP BMT.
The difference if you do before or after is.
Before: Your pass Napfa and go medical checkup, and graded PES C.
Then all the effort you took to pass Napfa goes to waste since
whether or not you pass Napfa doesn't matter if you are PES
C.
After: After medical checkup up, you know your PES status, then you
can decide if you need to take napfa at all.