RP at Paya Lebar Air Base... good luck man! 
FDS is like RP + rifleman, bao ka liao. In addition to RP training
(learning about various SAF laws) you will also be trained in basic
infantry skills like weapons handling (gpmg, saw, law, m203). You
will also have a bit of outfield training, section/platoon live
firing, fibua, chem defence...
Duty wise, it varies from base to base. Mostly its 24 or 48 hour
duty followed by an off day, working in shifts. You can kiss
goodbye to most public holidays.
FDS got no weekend or PH, its either you're on duty or off
duty.
If you lucky, u might get posted to an admin post within FDS, then
its 9-5.
Dog unit within FDS, only RPs trained at Mowbray will be posted
there.
The highest you can be promoted to is Cpl for 'A' or diploma
holders.
FDS is not physically siong, but is mentally draining. You will be
doing almost the same thing for the rest of your NS life. For
reservist, you will most likely be posted back to PLAB FDS.
Among the 4 bases, PLAB and Tengah are the most siong b'cos they
hold the largest numbers of fighter aircraft. PLAB is slightly more
siong b'cos it is located so near to civilian areas.