The 401 is a variant of the Atlas V, using a 4m diameter payload shroud, with one solid booster and a single RL-10 engine on the Centaur second stage.
Decals are provided for the SBIRS Geo-4, Solar Orbiter, and Osiris-Rex missions, all of which used the short payload fairing ( a version of the kit with the medium fairing will be available soon ).