A draftee went in for his physical wearing a truss and with a little convincing

A draftee went in for his physical wearing a truss and with a little convincing acting got his papers marked M.E.
for Medically Exempt.
Afterward a friend borrowed the truss to wear for his physical.
At the end of the examination the doctor stamped M.E.
on his papers.
"Does that mean I'm medically exempt?
" he asked.
"No," answered the doctor.
"M.E.
stands for Middle East.
Anyone who can wear a truss upside down can certainly ride a camel."