First of all, thanks for your service and welcome. I would say stick to the kit you are familiar with and which has worked out for you in the real world. When, and if it wears out, or if it just does not work for the application then it is time to replace it. As I am sure you know, not all government issued equipment is the best, for example cotton BDUs are terrible in cold, wet conditions.
Assess what works for you in your area and what doesn't. You may be able to use some of your kit, all of it or none of it. It will probably take a couple of trips to figure it out.