| Titan 1-2 LOx/Kerosene propellant rocket stage. . |
| Titan 2-2 N2O4/Aerozine-50 propellant rocket stage. . |
| Titan 3A-2 N2O4/Aerozine-50 propellant rocket stage. . |
| Titan 3B-2 N2O4/Aerozine-50 propellant rocket stage. . |
| Titan LDC-2 N2O4/Aerozine-50 propellant rocket stage. 15 foot diameter core Titan proposed in 1960's for space station logistics. Masses estimated. |
| Titan 4-2 N2O4/Aerozine-50 propellant rocket stage. . |