Level of Clearance

[malamudagain]

Don't know where you got this from.  Signals and CELE Air Officers require Lvl 3 as do many other officer trades.  And yes, they are operational trades.

At the CFRC they give you a list, with the trades listed under different branches.  The trades you mention fall under the "Engineering" section.

Operational Officers, as listed on the CFRC recruitment sheet are:
AEC
ACSO
Pilot
MARS
Artillery
Infantry
Armoured

And Mr. Wallace, I says on the sheet I have that Armoured and Artillery are Lev 1 with Infantry Lev 2.
Whether that's the case in real life, you would know probably better than me, but I'm just saying what I was given and what it says on the sheet.