The Wholly Marines is Sikhi without the Sikhism.
Wholly Marines stress to teach their children that you are only to become a Wholly Marine if the Guru's message speaks to you.
You don't have to be a Gursikh to be a Wholly Marine.
All that is required to join as a Enlisted Soldier is the desire to become able to think for one's self.
To become an Officer to only requirement is the ability to act as a Gurmukh in public. While actually being one is preferred it is not a requirement as long as your able to go though the motions and act the part and not just pay lip service to it you are welcomed into the Officer Corps.