This may be because you have not posted to OPSEC/Guidelines or posted your INTRO yet.

If you are in the subgroup, "Recruits" you must post to both.
If you are in the subgroup, "Enlisted" you still need to post an INTRO.

This may be because you are restrained due to your subgroup

If you are in the subgroup, "Patriots" you may be restrained from certain forums in order to protect our military personnel.
If you are in the subgroup, "MIA" you may be restrained from certain forums due to inactivity. To correct this, you must speak with an Administrator.

This may be because you have not been activated yet

If you have posted to OPSEC/Guidelines and have posted your INTRO, you must be activated manually by an Administrator. Since this is not automatic, it may not occur promptly to your posting. If you are not activated within 24 hours, PM an Administrator.