Supposedly computer logarithms, lah.
I taught an Arty mono batch before, so can answer that part (but
dunno how common the practice is across the SAF). Those who tio my
unit intake, the BMT instructors get to wholly decide -- recommend
-- who to retain after POP.
The combat-support weapons were more labour-intensive in my time.
My active-time outfit numbered about 125 ex-mono intakers
(mortarmen & M113 drivers), of which 10-15 were "extra" troops
to offset any ensuing downgrading cases, detention-barracks cases,
SAFSA attachments, etc.
The new BMT batch conscripted an extra BTY, making it about 200
recruits in all. So my estimation is that about 65-70 percent of
them were retained for Arty trade course, & a slightly-lower
percentage thereafter for operational life. The rest were
presumably sent back to the CMPB computer for other vocational
deployments. Never found out where they ended up, though as a
reservist I ran into two or three later on at Amoy Quee. (They
became storemen.)
