The entire military is composed of tiers. They exist within Special Operations Forces, within services, and within major units.
Some units are more 'high speed' than others, and if having better training and equipment is important to you, then you'll need to back that up with commitments. Go active, go airborne, volunteer for different MOSs, etc. Your life will be harder, but you'll be more ready for actual combat when the time comes.
If you want a part time job in an easy unit, where you don't have to train often, and won't be getting the newest gear, then expect to arrive in combat without the same level of training or equipment as the full timers.
There's simply no way to equip all units as well as the best equipped unit out there. Infantry squads aren't equipped half as well as a Special Forces ODA. As a soldier, you can either make due, make field expedients, move up the food chain to a better unit, or get out. That may sound harsh, but that's reality.
Waaah....waaah...I'm a supply clerk in a REMF unit and I'm gonna whine cause I don't have the same highspeed toys that the guys in an SF ODA have! IT'S NOT FAIR!!!
Why do I have to drive to BIAP in my old 1984 Hummer to go to Burger King when those guys over in 13th Tank get to ride the roads in those Abrahams Tanks???? WAAAHHHH! /sarcasm
It does sound harsh. How can we win a war with an US vs. THEM mentality--the us and the them all being our own guys???