Generally speaking i don't think you need to worry about it.
Humans talk!! and you folks are all in the same unit, simple as
that. Although said REC might not be involved in the unit ops nor
the ppl whom he shares it with, i would think it is harmless UNLESS
he starts discussing this with others outside of your unit (or ppl
not involved with it).
Another way to look at it is, what's his motive of discussing it
with others? is it in a general conversation that it pops up "eh..
you know tmrw's ops involves xxxx of vehicles, the paperwork damn
siong can??" or does he talk about it to flaunt his access to such
info?
And you would be amazed what is classified "confidential" i.e.
COA's movement (funny how all of us had his movement in our PDAs),
shuttlebus timings in MINDEF, Table of Precedence (TOP)...
