Problems you need to overcome
1) How SAF view ur prison sentence. With the problems in the
past few years, soldier misbehaving, with the recent "soldier steal
car for joy ride", I am not quite optimistic of ur chances.
2) How SAF grade ur medical assessment. Depends on ur asthma
problem, if ur asthma will act up periodically even without
medication, chances are still low. Remember, u are aiming for
combat vocations, so u dun expect ur platoon to stop just because
ur asthma acts up, the army cannot function this way.
3) How SAF will consider ur mental health. SAF have its own
psychiatric department, you will still need to get thru them
as well, these are medical officers (doctors) who ususally also
work in IMH, so dun get surprised if u see a IMH doctor u know, now
wears a uniform and u have to salute him.
Lastly, if u decide to hide all this information from them, just
be prepared to get back fired and you end up in Detention Barracks
(SAF's prison, yes, SAF have its own prison) for lying and
withholding information. BTW, if u commit an offence as a soldier u
will need to face two court (Civilian and Military), so if u cannot
adequately control what you do during ur depression, I strongly
suggest against joining SAF, u will suffer even more.