Military Police Officers are more of an administrator. Yes you will learn how to use a C7 and a Sig P225, however your training will be focussed on management, planning, and organization. Pros: you get paid slightly more once you're a qualified MPO Cons: you do more paperwork and less of the cool stuff like most officers in any trade.
As a reservist, you'll be part of a Field Unit, and the focus is not on the Policing side but more of the augmenting combat units, vehicle checkpoints, force and close protection, Prisoner/Detainee handling, base security and defence. As a Res MPO you may learn some of the following, but may not get to implement it unless you are deployed or tasked to the Reg Force.
You will not necessarily get to patrol, or conduct investigations; as an MPO is much like an Inspector or a Superintendent of a civilian police force, they just make sure all the rights steps are being taken, nobody's rights are being violated, evidence is protected etc.
