It’s a good question and one that I’m sure will be asked by many. One of the factors we are focusing on here is providing accurate and current information which will hopefully dispel a few myths.
Essentially- You can Commission first then join from an OTC/other AR unit, pending a pass at the Regimental selection board with 4 PARA CO/RSM. You will then complete P Coy as an AR Officer. Hopefully @Westy or @Big_Shep can jump on and explain in more detail if required.
So you can come in with a commission gained elsewhere via regular, AR or OTC and passing P Coy. Again full disclosure is I left in 2017 but hopefully @Westy can confirm if Ex AIRBORNE Student is still running. I’ll not discuss it until he confirms it’s not outdated. There is a process in which you can commission from the ranks but this is very much dependent on your SJARs (Annual reports) and interviews with OC/CO. Don’t bank on it and the most efficient way to become an officer is to join as one.
Airborne Student is no longer running, so all Officers who transfer across from Other units now have to complete All Arms PPS with 4 PARA - you have to be in an Airborne unit to complete now, so trying to get on the course from other AR units is a no go. IF you are Commissioning from the ranks, or transferring across you still have to pass 4 PARA RSB with the Commanding Officer.
The above statement is quite vague, however I will focus on the Platoon Commander role - All of the barrack responsibilities are the same, MPAR/SJAR, planning weekly training for Pln, working with Coy 2IC to develop training.
Role on exercise is tactical, writing/delivering orders and leading the Platoon.
RMR as far as I'm aware do not do the tactical side as Reserve Officers (happy to be advised otherwise)
Educational requirements are the same as Regular Officers.