Command massive armies of tough space marines or nightmarish cyborgs in endless battles across the Strogg home planet.
Strogg fighters (a model recreated from Quake 4) roam the skies of Artemis unopposed, as humanity has not yet located this world through their tenuous hold on the slipgate, leaving this planet's orbital defense chain intact and able to strike humans on the surface at will.
I don't recall the Strogg fighters looking like this.
I only ever saw it in the assets of Quake 4 by opening the editor and looking around, I think they may have been in the sky far away in the first Quake 4 level. The same with the marine fighters, which are distinct from their drop ships.