This is a Work in Progress and as such, players should not be using it in their biographies until it is finalized. Skill Devices: Each major skill a Marine must have is tested very often, often as twice as month but never less than six times per year. For each of these major skills, Marines are authorized to wear a device with a 'bar' underneath it with the appropriate weapon or skill embossed upon it. The following skills are authorized for skill devices: