maybe only limitedly possible. As you are not PesA/B, there is
limited stuff you can do. For clerks, its rarely you can become
3SG. Unless you are some clerk spec, or intel spec, admin spec,
etc...
But even these specs, normally they were also Pes A/B, then maybe
1-1 1/2 years something happened and then they downgraded to become
admin specs.
