radio(s).
start with set of 4 UV-5r.
you want 4 because you need 2 to make a repeater.
UV-9r is 2x the watts and bigger stock battery AND waterproof for only $8 more but accessories like long antenna etc cheaper for 5r and 5r much smaller.
Instead of "night vision" consider Seek Thermal mini-cam that works with smart phone. Pretty cheap at under $200 and you can spot humans at night at a few hundred yards. You can also see neat stuff like people behind fences, which cars are "hot" from 100s of yards away, and if someone has been sitting in a chair, etc.
Kevlar helmet says "shoot me" or at least search me for weapons.
I suggest an "El Dorado" or "Vulcan" (larger head size) cowboy hardhat. harder to sucker punch someone, and good protection from thrown rocks/bottles, and falling after tripping, etc and good sun shade.>>582379