These can occur in public an factional battles. It will be signaled to all players by having 'The juggernaughts are here' on the HUD, like 'you have been scanned'. A npc controlled unit or squad would arrive in the battle field. Ranging from scouts to sentinels and from shotgunners to snipers,they would use hyper proto officer eq,including weapons and suits. They would attack everyone but themselves. If you manage to kill one it would be 100% chance to get one piece of eq or suit they used.And x2 sp received at the end of the battle (not to exceed the cap). Their color could even be yellow.
And the logis among them would rep (differing officer rep tools) and carry nanos (differing officer nanos) (with 30hp/s repair themselves). They cannot hack or respawn.
They would be almost unkillable without teamwork. (having 20hp/s passive repair)
They would work as a unit tactically moving around the battlefield.
The main objectives would still exist,but this gives another optional goal to shoot for.

By super proto do you mean jove tech?
Could be an angel cartel attack.
But they still haven't worked out pve much less pvpve