At this stage, I assume that you have already been accepted to
OCS? If so, you'd better make your choice quickly-- medicine or the
SAF. I haven't heard of NUS Med allowing entry to be deferred in
lieu of completing your NS, this is because male med students are
expected to do their NS as MOs-- this is where we get the majority
of our MOs.
You can, however, choose to do medicine under the SAF LSA
Medical Scholarship, in which case you can get your medical degree
then go work for the SAF. With the active role that the SAF is
taking in regional and global natural disaster response and such,
you will find that your skills will be used more than a
non-military doctor; besides, good regular doctors in the SAF are
pretty highly prized.
Please do PM or email me if you want more info about either SAF,
medicine or the SAF medical scholarship-- I happen to know abit
about it because I almost took it up myself ;)