Your Grandfather's Army, ah? ~lol~ Sorry, can't resist
....
No, impossible. No such legal provisions; neither is it practical
nor investable (kinda like a Poly grad asking why lose out go to
NTU -- cannot double-subsidise everyone, mah).
Anyway, those Pes C9 are supposed to be on 5-year standby, i.e. can
still kena reservist. If never called back, they're still posted on
to MINDEF reserve & won't be formally discharged until they
turn 40 (will receive a confirmation letter).