It's commonly called the 302, [email protected], after the form for declaring
homosexuality.
The ostensible reason is that homosexuality works against the
morale of combat units, since each man will have to count on the
others, and vice versa, and it is felt that homosexuality is likely
to create a trust issue amongst many of the men.
Also, conscientious objectors are placed in non-combat roles.
Ironically, I know a Jehovah's Witness who became an armourer
during his NS.
