The NERVA Boosters, having injected the Argosy spacecraft onto their Mars trajectory, separate from the mission spacecraft. After their crews perform maneuvers to widen the distance between the boosters and the Argosy ships, they will use their main engines to brake, and begin an elliptical course back to low Earth orbit. There, they will be refueled and refurbished for work in cislunar space.
Modeled and rendered in Lightwave 10, and touched up in Photoshop CS3.
Thanks for taking a look!