I personally think the L-Code distinctions are important only to
guide vocational postings. Once you get to the unit, your welfare
will be respected but sometimes it may close one eye on how to
deploy you (as long as it's not unrealistic or blatant). Unit needs
overrides, like for example PES C guys doing guard duty (mentioned
in another thread).
For L2 & L3 cases, IMO only suay-suay will kena frontline units
(even if it's to be rear-echelon staff there). Instead, the bulk of
them shall go to combat-support, or training school, or
Formation-/Brigade-level outfits. If they want you to occasionally
move out & set up tentage for CPX exercises, then take them in
stride lah. Won't die-die.