The unofficial street ideas for military

Only apply to some reservist army unit, not regular troops.
Only apply to some British-Chinese style army, other culture may be different.
(no prize for guessing which army)

First got to warn those got low know how of Army stuff.
No matter what kind, national guards reserve or green Beret Ranger.
It's still a regimental organization.
Meaning zero tolerance to discipline matter.
Missing one day from work or school may not sound serious for Civilian. The most I quit the job or ask parent to write some letter.
For ARMY it's called AWOL - Absent Without Official Leave.
This is normally consider SERIOUS OFFENSE !!!