A few ways you can play this, not necessarily being the lower
rank you do not have your ways:
Choice 1: Find out which other officer/ senior NCO in the unit has
a beef with him. Send this guy an anoynomous letter about the
situation and let loose the rumors against him. Sooner or later the
following may happen - (A) his commanding officer hear about it and
tell him to be more aware and he just lan lan have to let things
go, (B) some senior staff with a grudge or personal agenda will
forward this to somewhere and blow it up to get rid of him or (C)
he is aware that everyone knows and decides to stop due to the peer
pressure.
Choice 2: Get one guy and go to S1 (or the S1 clerk) and say he is
thinking of committing sucide. This will set off the alarm bells
and everyone will start to take it seriously. But must really know
how to act. Get the guy who always ganna tekan by this
officer.
This is just 2 ways. I have more. Must learn to play the "GAME'
mah. SAF is not owned by him, it is a big and complex system. If
you know the system well, you CAN fight back.