for-all-mankind: Atlas V with OA-6 poised for launch Orbital ATK’s OA-6 mission atop a United Launch Alliance Atlas V rocket at SLC-41, March 22, 2016. Rollout from the Vertical Integration Facility to the pad occurred yesterday, March 21. The 200-foot Atlas V rocket will fly in the 401 configuration, denoting a four-meter diameter payload fairing, no solid rocket boosters, and a single-engine Centaur upper stage. OA-6 is the 32nd flight of Atlas in the 401 configuration, 62nd flight of an Atlas V rocket, and the 106th flight of a ULA rocket.