When 75th has recruited officers in units I've been in the policy was always you had to have done a successful tour in the job in the regular Army before doing that job in the 75th - with some exceptions for specialty personnel. All the infantry guys who went to regiment to be PLs had already been PLs, commanders the same - the main reason most of the officers are senior for the position. I understand there was a program (not sure if it still exists) taking MI officers out of the basic course and letting them go through RIP/ROP, serve at regiment, go to school, then serve in a BN as an AS2. I was told as a senior CPT that it was very difficult for a field grade to serve in the regiment if they hadn't served as a company grade. However, there is a MILPER that comes out each year recruiting field grades for regiment - so there may be specific criteria that don't include prior service in the regiment.