Like some other people have said, you should ask your friends that already attended training at the Arty School. After CAP, Phase 3 or Dp something or another is a combination of field, air defence, and locating modules. The bulk of the work focuses on the field side of the house. I hope this helps out!! P. S. Don't believe everything you hear because all three have different things to offer. Most RMC cadets end up on the field side.