It was largely a commercial rebrand of the Atlas G (although it did fly multiple government payloads), but did feature several electrical and guidance improvements.

[5] In June 1987, General Dynamics committed $100M to acquire long-lead procurement items to support the build of 18 vehicles for sale commercially.

While retaining most of those features, Atlas II replaced the verniers with a hydrazine roll control system.

Each LR-89-7 had its own turbopump to feed propellants into the combustion chamber, but the two engines shared a single common gas generator.

Centaur could be reignited to propel payloads to a geostationary transfer orbit, which was by far the most common flight profile on Atlas I.

This kit included a larger battery, increased helium storage, additional shielding on the stage, and an extra bottle for hydrazine.

This small solid rocket motor would help give payloads a final push away from Earth shortly after separating from Centaur.