Enclave Soldier Encounters
If you're a fan of the Enclave and you want the faction to make an appearance in Fallout 4, you'll need to use mods.
One such mod is Enclave Soldier Encounters which brings Enclave soldier encounters to the lands of the Commonwealth.
As you roam the wasteland, you'll encounter pockets of Enclave soldiers who wear combat armor and yes, power armor.
The developer has, for the time being, suspended support for the mod. Like many others, we're hopeful that the developer returns sometime down the road with some new features and bug fixes in tow.
That said, we like it in its current state. Give it a shot.